{"title":"OS Giken","description":"\u003cp\u003eUnleash the full potential of your JDM sports car, Nissan Skyline, 240SX, Toyota Supra, or Honda S2000 with the uncompromising precision of OS Giken drivetrain components. \u003cspan class=\"citation-465\"\u003eAs a leader in Japanese high-performance engineering, OS Giken delivers clutch, LSD, and gear solutions trusted by professional \u003c\/span\u003e\u003cspan class=\"citation-465\"\u003edrift, drag, and circuit racing\u003c\/span\u003e\u003cspan class=\"citation-465 citation-end-465\"\u003e teams worldwide.\u003csup class=\"superscript\" data-turn-source-index=\"2\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eAt Straight Six Imports, we supply the full catalog of OS Giken parts designed for exceptional power handling and unrivaled durability, giving you maximum control and confidence on the track or the street.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWhy Choose OS Giken for Your Performance Build?\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSuperior Clutch Technology:\u003c\/b\u003e\u003cspan class=\"citation-464\"\u003e Explore the multi-plate clutch lineup—from the \u003c\/span\u003e\u003cspan class=\"citation-464\"\u003eTS (Single\/Twin)\u003c\/span\u003e\u003cspan class=\"citation-464\"\u003e and \u003c\/span\u003e\u003cspan class=\"citation-464\"\u003eTR (Twin\/Triple)\u003c\/span\u003e\u003cspan class=\"citation-464\"\u003e series to the extreme \u003c\/span\u003e\u003cspan class=\"citation-464\"\u003eR-Series\u003c\/span\u003e\u003cspan class=\"citation-464\"\u003e—engineered with proprietary pressure plate designs for \u003c\/span\u003e\u003cspan class=\"citation-464\"\u003ehigh torque capacity\u003c\/span\u003e\u003cspan class=\"citation-464\"\u003e and surprisingly \u003c\/span\u003e\u003cspan class=\"citation-464\"\u003elight pedal effort\u003c\/span\u003e\u003cspan class=\"citation-464 citation-end-464\"\u003e.\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eRevolutionary Super Lock LSD:\u003c\/b\u003e Experience the world-renowned OS Giken Super Lock Limited Slip Differential. \u003cspan class=\"citation-463\"\u003eIts patented design houses up to \u003c\/span\u003e\u003ci\u003e\u003cspan class=\"citation-463\"\u003etwice\u003c\/span\u003e\u003c\/i\u003e\u003cspan class=\"citation-463\"\u003e the number of friction plates compared to competitors, providing \u003c\/span\u003e\u003cspan class=\"citation-463\"\u003eprogressive, quiet, and reliable 100% lockup\u003c\/span\u003e\u003cspan class=\"citation-463\"\u003e without the harsh chatter, perfect for \u003c\/span\u003e\u003cspan class=\"citation-463\"\u003edrifting and road racing\u003c\/span\u003e\u003cspan class=\"citation-463 citation-end-463\"\u003e.\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"citation-462\"\u003e\u003c\/span\u003e\u003cb\u003e\u003cspan class=\"citation-462\"\u003ePrecision Gear Sets:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-462\"\u003e Maximize engine performance and transmission reliability with \u003c\/span\u003e\u003cspan class=\"citation-462\"\u003eOS Giken Close Ratio Gear Kits\u003c\/span\u003e\u003cspan class=\"citation-462 citation-end-462\"\u003e, meticulously calculated for faster acceleration and sustained power delivery through every shift.\u003csup class=\"superscript\" data-turn-source-index=\"5\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eUnmatched Durability:\u003c\/b\u003e\u003cspan class=\"citation-461 citation-end-461\"\u003e Every component is precision-machined from high-grade steel alloy and chemically heat-treated for longevity, eliminating the need for a break-in period and minimizing rebuilds.\u003csup class=\"superscript\" data-turn-source-index=\"6\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUpgrade your transmission, put the power down, and drive with total confidence. Straight Six Imports is your trusted source for authentic JDM OS Giken performance parts.\u003c\/p\u003e","products":[{"product_id":"os-giken-lsd-nissan-350z-370z","title":"OS Giken Super Lock LSD – Nissan 350Z (Z33) \/ 370Z (Z34) | Patented Pressure Ring Design | Japan-Made (NS111-HA)","description":"\u003ch3\u003eOS Giken Super Lock LSD – Nissan 350Z (Z33) \/ 370Z (Z34) | Patented Pressure Ring Design | Up to 2x More Friction Plates | Japan-Made\u003c\/h3\u003e\u003cp\u003eThe OS Giken Super Lock LSD for the Nissan 350Z (Z33) and 370Z (Z34) is one of the most technically advanced and highly regarded limited-slip differentials available for the Z-car platform — featuring OS Giken's patented pressure ring design, spline-through-side-gear construction, and a billet-machined LSD case that allows for up to twice as many friction plates as competing designs. The result is a smooth, progressive, fully capable 100% locking LSD that completely transforms the 350Z and 370Z's rear axle performance while maintaining everyday street drivability. OS Giken is one of the most respected drivetrain and engine component manufacturers in Japanese motorsport — a company with decades of experience supplying precision drivetrain components to professional racing teams and serious performance enthusiasts across Japan and internationally.\u003c\/p\u003e\u003ch4\u003eKey Features:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePatented pressure ring design — OS Giken's patented pressure ring design allows for smooth, progressive locking action — the pressure ring engages the clutch pack progressively as torque differential increases, providing controlled and predictable LSD behaviour\u003c\/li\u003e\n\u003cli\u003eSpline-through-side-gear design — OS Giken's spline-through-side-gear construction allows for fitment of up to 2x as many friction plates as competing LSD designs — more friction surface area for more effective torque transfer and greater LSD durability under sustained high-load use\u003c\/li\u003e\n\u003cli\u003e100% progressive lock capability — the OS Giken Super Lock achieves full 100% locking capability through progressive clutch engagement — not a sudden, binary lock, but a smooth, controlled progression to full lock that is predictable and manageable on both street and track\u003c\/li\u003e\n\u003cli\u003eLow preload standard spec — the standard OS Giken LSD specification uses low preload — quiet operation and smooth, progressive locking that maintains everyday street drivability without the harshness or noise associated with high-preload LSDs\u003c\/li\u003e\n\u003cli\u003eBillet-machined LSD case — the LSD case is machined from a single billet piece to ensure uniformity, dimensional accuracy, and maximum strength — no casting porosity or dimensional variation\u003c\/li\u003e\n\u003cli\u003eRaw-forged gears — gears are raw-forged for maximum strength — forged gears have superior grain structure and fatigue resistance compared to machined-from-billet or cast alternatives\u003c\/li\u003e\n\u003cli\u003eChemically heat treated components — all components are chemically heat treated for maximum durability — correct hardness and wear resistance for sustained high-load LSD use\u003c\/li\u003e\n\u003cli\u003eHigh-grade steel alloy construction — all components are constructed from a high-grade steel alloy — correct material specification for the thermal and mechanical demands of a performance LSD\u003c\/li\u003e\n\u003cli\u003ePrecision-machined clutch discs — clutch discs are precision-machined simultaneously on both sides to extremely tight tolerances — minimal warpage for consistent clutch pack engagement and long-term LSD performance\u003c\/li\u003e\n\u003cli\u003eJapan-made — manufactured in Japan by OS Giken to their exacting motorsport quality standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOS Giken Pressure Ring Design — Why It's Different:\u003c\/h4\u003e\u003cp\u003eMost clutch-type LSDs use a conventional cam-and-ramp design to engage the clutch pack — the side gears push against ramp surfaces that compress the clutch pack as torque differential increases. OS Giken's patented pressure ring design replaces the conventional cam-and-ramp with a pressure ring that engages the clutch pack more uniformly and progressively. The pressure ring design distributes the engagement force more evenly across the clutch pack — reducing clutch disc warpage, improving engagement consistency, and allowing for a smoother, more progressive locking action than conventional cam-and-ramp designs. Combined with the spline-through-side-gear construction that allows for up to 2x more friction plates, the OS Giken Super Lock's clutch pack has significantly more friction surface area than competing designs — more effective torque transfer and greater durability under sustained high-load use.\u003c\/p\u003e\u003ch4\u003e350Z \/ 370Z — Why an LSD Transforms the Platform:\u003c\/h4\u003e\u003cp\u003eThe Nissan 350Z (Z33) and 370Z (Z34) are rear-wheel-drive sports cars with the VQ35DE\/HR and VQ37VHR V6 engines respectively — powerful, rear-wheel-drive platforms that are highly sensitive to rear differential performance. The factory Nissan Torsen LSD (where fitted) or open differential limits the Z-car's ability to put power down effectively on corner exit — particularly under the high torque loads of the VQ35HR and VQ37VHR. The OS Giken Super Lock LSD's progressive 100% locking capability transforms the 350Z and 370Z's corner exit behaviour — transferring torque to the rear wheel with traction rather than the spinning wheel, allowing the car to drive out of corners with significantly more rear traction and more predictable, controllable chassis behaviour. The result is a completely improved driving experience on both street and track.\u003c\/p\u003e\u003ch4\u003eSpecifications:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e OS Giken\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e osgNS111-HA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode:\u003c\/strong\u003e NS111-HA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Clutch-type LSD (Super Lock) — patented pressure ring design\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFriction Plates:\u003c\/strong\u003e Up to 2x more than competing designs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLock Capability:\u003c\/strong\u003e 100% progressive\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase:\u003c\/strong\u003e Single billet-machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGears:\u003c\/strong\u003e Raw-forged\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Treatment:\u003c\/strong\u003e Chemical heat treatment on all components\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Nissan 350Z (Z33) \/ Nissan 370Z (Z34)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment Information:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eNissan 350Z — Z33 chassis — VQ35DE \/ VQ35HR — all variants\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNissan 370Z — Z34 chassis — VQ37VHR — all variants\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Professional installation by an experienced drivetrain specialist strongly recommended. A break-in procedure is required after installation. Use the correct OS Giken-specified differential fluid — incorrect fluid will damage the clutch pack. Verify your specific 350Z or 370Z variant before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhat's Included:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOS Giken Super Lock LSD unit — Nissan 350Z \/ 370Z (osgNS111-HA)\u003c\/li\u003e\n\u003cli\u003eRefer to OS Giken's product documentation for complete kit contents, installation specifications, fluid specification, and break-in procedure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eInstallation Notes:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eProfessional installation by an experienced drivetrain specialist strongly recommended — LSD installation requires correct differential disassembly, correct clutch pack preload setting, correct ring and pinion backlash adjustment, and correct bearing preload\u003c\/li\u003e\n\u003cli\u003eUse the correct differential fluid specification for the OS Giken Super Lock LSD — clutch-type LSDs require a specific friction modifier content in the differential fluid — using the wrong fluid will cause clutch pack wear and incorrect LSD behaviour. Refer to OS Giken's fluid specification for this unit.\u003c\/li\u003e\n\u003cli\u003eA break-in procedure is required after installation — follow OS Giken's break-in procedure to correctly seat the clutch plates before subjecting the LSD to full-load use\u003c\/li\u003e\n\u003cli\u003eChange the differential fluid after the break-in period — the initial fluid change after break-in removes clutch plate material deposited during the break-in process\u003c\/li\u003e\n\u003cli\u003eVerify correct LSD function after installation — the LSD should engage progressively and smoothly under load — any grinding, chattering, or binding indicates incorrect installation or incorrect fluid specification\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhy OS Giken?\u003c\/h4\u003e\u003cp\u003eOS Giken is one of the most respected drivetrain and engine component manufacturers in Japanese motorsport — a company with decades of experience supplying precision drivetrain components to professional racing teams and serious performance enthusiasts across Japan and internationally. OS Giken's Super Lock LSD is their flagship limited-slip differential design — a patented pressure ring clutch-type LSD that has been proven in Japanese touring car racing, time attack, and circuit competition across multiple platforms. For 350Z and 370Z owners who want the most technically advanced, motorsport-proven LSD available for the Z-car platform, OS Giken Super Lock is the definitive choice.\u003c\/p\u003e\u003ch4\u003ePerfect For:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eNissan 350Z (Z33) and 370Z (Z34) owners who want the most premium, technically advanced LSD upgrade available — OS Giken's patented pressure ring Super Lock for smooth, progressive 100% locking capability and transformed rear axle performance\u003c\/li\u003e\n\u003cli\u003eZ-car track day and time attack builds where rear axle traction, corner exit performance, and chassis balance are critical for lap time and driving confidence\u003c\/li\u003e\n\u003cli\u003eStreet-driven 350Z and 370Z owners who want a performance LSD that completely improves the driving experience while maintaining everyday drivability — the OS Giken's low preload standard spec and progressive locking action make it equally suitable for street and track use\u003c\/li\u003e\n\u003cli\u003eSerious Z-car performance builds where OS Giken's motorsport credentials, patented pressure ring design, and Japan-made quality are the correct choice for a critical drivetrain component\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Professional drivetrain specialist installation required. Use correct OS Giken-specified differential fluid — incorrect fluid will damage clutch pack. Break-in procedure required after installation. Change fluid after break-in period. Verify 350Z or 370Z variant before ordering.\u003c\/p\u003e","brand":"OS Giken","offers":[{"title":"Default Title","offer_id":40036947361959,"sku":"osgNS111-HA","price":2128.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/products\/os-giken-lsd-113.jpg?v=1621262496"},{"product_id":"os-giken-lsd-nissan-gtr-r35","title":"OS Giken LSD - Nissan GTR (R35)","description":"\u003cp data-mce-fragment=\"1\"\u003eThe OS Giken Super Lock LSD uses our patented pressure ring design that allows for smooth, progressive locking. This design is a spline-through-side-gear design that allows for fitment of more friction plates (up to 2x as many as competitors versions).\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eAll components are chemically heat treated for maximum durability\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eAll components are constructed from a high-grade steel alloy\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eGears are raw-forged for maximum strength\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eClutch disks are precision-machined simultaneously on both sides to extremely tight tolerances resulting in minimal warpage.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eLSD case is machined from a single billet piece to ensure uniformity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe OS LSD standard spec allows for low preload while still retaining a fully progressive 100% lock capability. Operation is quiet and the progressive locking allows for smooth predictable locking. When replacing an open diff, equipping an\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eOS LSD will completely improve the driving experience while maintaining everyday drivability.\u003c\/p\u003e","brand":"OS Giken","offers":[{"title":"Default Title","offer_id":40036959846567,"sku":"osgNS251-HC","price":4593.76,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/products\/os-giken-lsd-118.jpg?v=1621262632"},{"product_id":"os-giken-80w-250-gear-oil-1l","title":"OS Giken 80W-250 Gear Oil – 1 Litre | Ultra-High Viscosity Competition Gear \u0026 Differential Oil (OS011-KA1)","description":"\u003ch3\u003eOS Giken 80W-250 Gear Oil – 1 Litre | Ultra-High Viscosity Competition Gear \u0026amp; Differential Oil\u003c\/h3\u003e\u003cp\u003eThe OS Giken 80W-250 Gear Oil is an ultra-high viscosity competition gear oil engineered specifically for OS Giken limited slip differentials and competition differential applications — where the extreme contact pressures, high operating temperatures, and demanding friction requirements of OS Giken's LSD clutch pack systems demand a gear oil formulated to a specification that standard 75W-90 and 75W-140 gear oils cannot meet. This listing is for a \u003cstrong\u003esingle 1 litre bottle\u003c\/strong\u003e. Also available in a case of 6 x 1L for bulk purchasing. The 80W-250 viscosity grade is exceptionally high — significantly thicker at operating temperature than even the 75W-140 grade used in demanding performance applications — providing the extreme-pressure oil film thickness that OS Giken's high-performance LSD units require for correct clutch pack operation, gear protection, and long-term reliability under competition loads.\u003c\/p\u003e\u003ch4\u003eKey Features:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSingle 1 litre bottle — correct for a single differential service or topping up an OS Giken LSD unit — also available in a case of 6 x 1L for bulk purchasing\u003c\/li\u003e\n\u003cli\u003e80W-250 ultra-high viscosity — exceptionally high viscosity grade engineered for the extreme contact pressures and operating temperatures of OS Giken LSD and competition differential applications — significantly thicker at operating temperature than 75W-140 alternatives\u003c\/li\u003e\n\u003cli\u003eOS Giken LSD specific — formulated for the friction and viscosity requirements of OS Giken's limited slip differential clutch pack systems — correct oil for OS Giken LSD units\u003c\/li\u003e\n\u003cli\u003eExtreme pressure protection — ultra-high viscosity provides maximum oil film thickness under the extreme contact pressures generated by OS Giken LSD clutch packs and hypoid gear sets under competition loads\u003c\/li\u003e\n\u003cli\u003eCompetition grade — engineered for the demands of motorsport and competition use where standard gear oils are insufficient for the loads and temperatures generated\u003c\/li\u003e\n\u003cli\u003eOS Giken quality — manufactured by OS Giken, one of Japan's most respected high-performance differential and engine component brands\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhy 80W-250? Understanding the Viscosity Grade:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Gear Oil Viscosity Grades:\u003c\/strong\u003e Most performance differentials specify 75W-90 or 75W-140 gear oil — viscosity grades that provide adequate film strength for standard hypoid differential gear sets and most LSD clutch pack designs. The 75W-140 grade is considered a high-viscosity option for demanding applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOS Giken LSD Requirements:\u003c\/strong\u003e OS Giken's limited slip differentials are high-performance, high-engagement LSD units engineered for motorsport and serious performance applications — with clutch pack designs and engagement characteristics that generate significantly higher contact pressures and operating temperatures than standard LSD units. These extreme conditions require a gear oil with a viscosity grade that provides adequate film thickness under loads that would cause a 75W-140 oil to thin beyond its effective protection range. The 80W-250 grade provides the additional film thickness required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Pack Friction Characteristics:\u003c\/strong\u003e OS Giken LSD units have specific friction requirements for correct clutch pack engagement and release behaviour. Using a gear oil with incorrect viscosity or friction characteristics can cause incorrect LSD engagement, clutch pack chatter, or premature clutch pack wear. The OS Giken 80W-250 is formulated with the correct friction characteristics for OS Giken's clutch pack design — ensuring correct LSD behaviour and clutch pack longevity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo Not Substitute:\u003c\/strong\u003e Using a lower-viscosity gear oil (75W-90, 75W-140) in an OS Giken LSD that specifies 80W-250 will result in insufficient film thickness under competition loads — potentially causing accelerated gear and clutch pack wear. Always use the manufacturer-specified oil for OS Giken LSD units.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e OS Giken\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e OSGOS011-KA1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode:\u003c\/strong\u003e OS011-KA1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eViscosity Grade:\u003c\/strong\u003e 80W-250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume:\u003c\/strong\u003e 1 litre (single bottle)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e OS Giken LSD units and competition differentials specifying 80W-250 gear oil\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eRecommended Applications:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOS Giken limited slip differentials specifying 80W-250 gear oil — verify the correct oil specification for your specific OS Giken LSD model in OS Giken's product documentation\u003c\/li\u003e\n\u003cli\u003eSingle differential service or top-up — OS Giken LSD units typically require 0.5–1.0 litres per differential depending on the housing\u003c\/li\u003e\n\u003cli\u003eCompetition differentials and gear sets operating under extreme contact pressures and elevated temperatures where standard 75W-90 and 75W-140 gear oils are insufficient\u003c\/li\u003e\n\u003cli\u003eMotorsport applications — circuit racing, time attack, rally, and drag racing — where drivetrain reliability under extreme loads is critical\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eUsage Notes:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify the correct oil specification for your specific OS Giken LSD model before use\u003c\/strong\u003e — OS Giken produces multiple LSD models with different oil specifications. Confirm that 80W-250 is the correct specification for your specific unit in OS Giken's product documentation or by contacting Straight Six Imports.\u003c\/li\u003e\n\u003cli\u003eOS Giken LSD units typically require 0.5–1.0 litres per differential depending on the housing — verify your specific unit's fluid capacity before ordering to ensure you purchase the correct quantity. Order multiple bottles if required.\u003c\/li\u003e\n\u003cli\u003eFollow OS Giken's recommended fluid change interval for your LSD unit — competition use typically requires more frequent fluid changes than street use due to elevated operating temperatures and clutch pack wear debris accumulation\u003c\/li\u003e\n\u003cli\u003eDrain the old fluid completely and flush the differential before refilling with fresh OS Giken 80W-250 — mixing old and new fluid reduces the effectiveness of the fresh oil\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhy OS Giken?\u003c\/h4\u003e\u003cp\u003eOS Giken is one of Japan's most respected high-performance differential and engine component brands — known for their Super Lock LSD differentials, close-ratio gearboxes, and engine components used in professional motorsport and serious performance applications across Japan and internationally. OS Giken's LSD units are among the most highly regarded limited slip differentials available for Japanese performance platforms — used by professional racing teams and serious performance drivers who demand the highest level of differential performance and reliability. OS Giken's 80W-250 gear oil is formulated specifically for their LSD units — the correct oil from the brand that built the differential, engineered to the exact viscosity and friction specifications that OS Giken's clutch pack designs require.\u003c\/p\u003e\u003ch4\u003ePerfect For:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOS Giken LSD owners who want the correct, manufacturer-specified 80W-250 gear oil for a single differential service or top-up\u003c\/li\u003e\n\u003cli\u003eCompetition and motorsport builds running OS Giken LSD units where correct differential fluid specification is critical for clutch pack longevity and LSD performance\u003c\/li\u003e\n\u003cli\u003eDifferential fluid service on OS Giken LSD units after track sessions, competition events, or at the manufacturer's recommended change interval\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCritical Note:\u003c\/strong\u003e Single 1 litre bottle — verify your OS Giken LSD's fluid capacity and order the correct quantity. Verify that 80W-250 is the correct oil specification for your specific OS Giken LSD model before use — consult OS Giken's product documentation or contact Straight Six Imports. Do not substitute lower-viscosity gear oils. Follow OS Giken's recommended fluid change interval.\u003c\/p\u003e","brand":"OS Giken","offers":[{"title":"Default Title","offer_id":46850200174759,"sku":"OSGOS011-KA1","price":70.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/3be90d513ea8266da27172edf63e3ebcL.jpg?v=1750353034"},{"product_id":"os-giken-80w-250-gear-oil-1l-1","title":"OS Giken 80W-250 Gear Oil – Case of 6 x 1L | Ultra-High Viscosity Competition Gear \u0026 Differential Oil (OS011-KA16)","description":"\u003ch3\u003eOS Giken 80W-250 Gear Oil – Case of 6 x 1 Litre | Ultra-High Viscosity Competition Gear \u0026amp; Differential Oil\u003c\/h3\u003e\u003cp\u003eThe OS Giken 80W-250 Gear Oil is an ultra-high viscosity competition gear oil engineered specifically for OS Giken limited slip differentials and competition differential applications — where the extreme contact pressures, high operating temperatures, and demanding friction requirements of OS Giken's LSD clutch pack systems demand a gear oil formulated to a specification that standard 75W-90 and 75W-140 gear oils cannot meet. This listing is for a \u003cstrong\u003ecase of 6 x 1 litre bottles (6 litres total)\u003c\/strong\u003e. The 80W-250 viscosity grade is exceptionally high — significantly thicker at operating temperature than even the 75W-140 grade used in demanding performance applications — providing the extreme-pressure oil film thickness that OS Giken's high-performance LSD units require for correct clutch pack operation, gear protection, and long-term reliability under competition loads. For OS Giken LSD owners who want the correct, manufacturer-specified gear oil for their differential in case quantity, this is the correct product.\u003c\/p\u003e\u003ch4\u003eKey Features:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCase of 6 x 1 litre bottles — 6 litres total — correct for bulk differential service, multiple LSD units, or stocking the correct OS Giken fluid for ongoing maintenance\u003c\/li\u003e\n\u003cli\u003e80W-250 ultra-high viscosity — exceptionally high viscosity grade engineered for the extreme contact pressures and operating temperatures of OS Giken LSD and competition differential applications — significantly thicker at operating temperature than 75W-140 alternatives\u003c\/li\u003e\n\u003cli\u003eOS Giken LSD specific — formulated for the friction and viscosity requirements of OS Giken's limited slip differential clutch pack systems — correct oil for OS Giken LSD units\u003c\/li\u003e\n\u003cli\u003eExtreme pressure protection — ultra-high viscosity provides maximum oil film thickness under the extreme contact pressures generated by OS Giken LSD clutch packs and hypoid gear sets under competition loads\u003c\/li\u003e\n\u003cli\u003eCompetition grade — engineered for the demands of motorsport and competition use where standard gear oils are insufficient for the loads and temperatures generated\u003c\/li\u003e\n\u003cli\u003eOS Giken quality — manufactured by OS Giken, one of Japan's most respected high-performance differential and engine component brands\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhy 80W-250? Understanding the Viscosity Grade:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Gear Oil Viscosity Grades:\u003c\/strong\u003e Most performance differentials specify 75W-90 or 75W-140 gear oil — viscosity grades that provide adequate film strength for standard hypoid differential gear sets and most LSD clutch pack designs. The 75W-140 grade is considered a high-viscosity option for demanding applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOS Giken LSD Requirements:\u003c\/strong\u003e OS Giken's limited slip differentials are high-performance, high-engagement LSD units engineered for motorsport and serious performance applications — with clutch pack designs and engagement characteristics that generate significantly higher contact pressures and operating temperatures than standard LSD units. These extreme conditions require a gear oil with a viscosity grade that provides adequate film thickness under loads that would cause a 75W-140 oil to thin beyond its effective protection range. The 80W-250 grade provides the additional film thickness required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Pack Friction Characteristics:\u003c\/strong\u003e OS Giken LSD units have specific friction requirements for correct clutch pack engagement and release behaviour. Using a gear oil with incorrect viscosity or friction characteristics can cause incorrect LSD engagement, clutch pack chatter, or premature clutch pack wear. The OS Giken 80W-250 is formulated with the correct friction characteristics for OS Giken's clutch pack design — ensuring correct LSD behaviour and clutch pack longevity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo Not Substitute:\u003c\/strong\u003e Using a lower-viscosity gear oil (75W-90, 75W-140) in an OS Giken LSD that specifies 80W-250 will result in insufficient film thickness under competition loads — potentially causing accelerated gear and clutch pack wear. Always use the manufacturer-specified oil for OS Giken LSD units.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e OS Giken\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e OSGOS011-KA16\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eViscosity Grade:\u003c\/strong\u003e 80W-250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume:\u003c\/strong\u003e Case of 6 x 1 litre (6 litres total)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e OS Giken LSD units and competition differentials specifying 80W-250 gear oil\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eRecommended Applications:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOS Giken limited slip differentials specifying 80W-250 gear oil — verify the correct oil specification for your specific OS Giken LSD model in OS Giken's product documentation\u003c\/li\u003e\n\u003cli\u003eCompetition differentials and gear sets operating under extreme contact pressures and elevated temperatures where standard 75W-90 and 75W-140 gear oils are insufficient\u003c\/li\u003e\n\u003cli\u003eMotorsport teams and shops stocking the correct OS Giken fluid for ongoing differential maintenance across multiple vehicles\u003c\/li\u003e\n\u003cli\u003eMotorsport applications — circuit racing, time attack, rally, and drag racing — where drivetrain reliability under extreme loads is critical\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eUsage Notes:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify the correct oil specification for your specific OS Giken LSD model before use\u003c\/strong\u003e — OS Giken produces multiple LSD models with different oil specifications. Confirm that 80W-250 is the correct specification for your specific unit in OS Giken's product documentation or by contacting Straight Six Imports.\u003c\/li\u003e\n\u003cli\u003eFollow OS Giken's recommended fluid change interval for your LSD unit — competition use typically requires more frequent fluid changes than street use due to elevated operating temperatures and clutch pack wear debris accumulation\u003c\/li\u003e\n\u003cli\u003eOS Giken LSD units typically require 0.5–1.0 litres per differential depending on the housing — a case of 6 litres is sufficient for multiple service intervals or multiple vehicles\u003c\/li\u003e\n\u003cli\u003eDrain the old fluid completely and flush the differential before refilling with fresh OS Giken 80W-250 — mixing old and new fluid reduces the effectiveness of the fresh oil\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhy OS Giken?\u003c\/h4\u003e\u003cp\u003eOS Giken is one of Japan's most respected high-performance differential and engine component brands — known for their Super Lock LSD differentials, close-ratio gearboxes, and engine components used in professional motorsport and serious performance applications across Japan and internationally. OS Giken's LSD units are among the most highly regarded limited slip differentials available for Japanese performance platforms — used by professional racing teams and serious performance drivers who demand the highest level of differential performance and reliability. OS Giken's 80W-250 gear oil is formulated specifically for their LSD units — the correct oil from the brand that built the differential, engineered to the exact viscosity and friction specifications that OS Giken's clutch pack designs require.\u003c\/p\u003e\u003ch4\u003ePerfect For:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOS Giken LSD owners who want the correct, manufacturer-specified 80W-250 gear oil in case quantity for multiple service intervals or multiple vehicles\u003c\/li\u003e\n\u003cli\u003eMotorsport teams and performance shops running OS Giken LSD units who want to stock the correct fluid in bulk\u003c\/li\u003e\n\u003cli\u003eCompetition and motorsport builds running OS Giken LSD units where correct differential fluid specification is critical for clutch pack longevity and LSD performance\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCritical Note:\u003c\/strong\u003e Case of 6 x 1 litre bottles — 6 litres total. Verify that 80W-250 is the correct oil specification for your specific OS Giken LSD model before use — consult OS Giken's product documentation or contact Straight Six Imports. Do not substitute lower-viscosity gear oils in OS Giken LSD units specifying 80W-250. Follow OS Giken's recommended fluid change interval.\u003c\/p\u003e","brand":"OS Giken","offers":[{"title":"Default Title","offer_id":46850200207527,"sku":"OSGOS011-KA16","price":420.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/3be90d513ea8266da27172edf63e3ebcL_12851cc6-cccd-48f6-a81a-3ad1c514630f.jpg?v=1750353034"},{"product_id":"os-giken-nissan-370z-z34-vq35hr-at-only-super-lock-lsd","title":"OS Giken Nissan 370Z Z34 VQ35HR (AT Only) Super Lock LSD","description":"\u003cp\u003eOS Giken Nissan 370Z Z34 VQ35HR (AT Only) Super Lock LSD\u003c\/p\u003e","brand":"OS Giken","offers":[{"title":"Default Title","offer_id":47040703168679,"sku":"OSGNS114-HA","price":2128.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/cbc69238aa960a2e079262612a6a49e5.jpg?v=1757884596"},{"product_id":"os-giken-04-99-04-04-honda-s2000-04-05-mazda-miata-mt-only-super-lock-lsd","title":"OS Giken 04\/99 - 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The ZN6\/ZC6 chassis is widely regarded as one of the finest handling platforms of its generation — a near-perfect front-to-rear weight balance, low centre of gravity, and a naturally balanced chassis that rewards driver skill. The factory differential, however, is a significant limiting factor in extracting the platform's full performance potential — particularly in cornering, track use, and drift applications where the ability to put power down through both rear wheels simultaneously is critical. The OS Giken Super Lock LSD eliminates this limitation — delivering the locked, consistent power delivery that allows the GT86\/FR-S chassis to perform to its potential.\u003c\/p\u003e\u003ch4\u003eKey Features:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOS Giken Super Lock clutch-pack LSD — OS Giken's proven high-performance clutch-pack limited slip differential design — engineered for motorsport and serious performance applications where consistent, locked power delivery is required\u003c\/li\u003e\n\u003cli\u003eDirect replacement for factory differential — engineered as a direct replacement for the factory GT86\/FR-S open or Torsen differential — installs in the factory differential housing without modification\u003c\/li\u003e\n\u003cli\u003eZN6\/ZC6 specific — engineered for the Toyota GT86 and Scion FR-S ZN6\/ZC6 chassis — correct gear ratios, clutch pack specification, and dimensions for the platform's differential housing\u003c\/li\u003e\n\u003cli\u003eMotorsport-proven design — OS Giken Super Lock LSD units are used in professional motorsport and serious competition applications across Japan and internationally — a proven design validated in the most demanding conditions\u003c\/li\u003e\n\u003cli\u003eAdjustable engagement characteristics — OS Giken Super Lock LSD clutch pack preload and ramp angles can be configured for the driver's specific application — from street performance to full competition use\u003c\/li\u003e\n\u003cli\u003eOS Giken quality — manufactured by OS Giken, one of Japan's most respected high-performance differential brands with decades of motorsport development experience\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhy the GT86 \/ FR-S Needs an LSD Upgrade:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Differential Limitation:\u003c\/strong\u003e The Toyota GT86 and Scion FR-S were equipped from the factory with either an open differential or a Torsen-type limited slip differential depending on the market and trim. The open differential provides zero torque biasing — power follows the path of least resistance, meaning the inside rear wheel spins freely under cornering load while the outside wheel receives minimal torque. The Torsen provides some torque biasing but is limited in its engagement under the conditions where an LSD is most needed — high-slip, high-load cornering and track use. Neither provides the consistent, locked power delivery that the GT86\/FR-S chassis is capable of exploiting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch-Pack LSD Advantage:\u003c\/strong\u003e A clutch-pack LSD like the OS Giken Super Lock uses a set of friction clutch plates to mechanically lock the differential under load — forcing both rear wheels to rotate at the same speed when the clutch pack engages. This provides consistent, predictable power delivery to both rear wheels under cornering load, acceleration out of corners, and in drift applications — allowing the driver to use the full torque of the FA20 engine through both rear wheels rather than losing it to the spinning inside wheel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrack Performance:\u003c\/strong\u003e On track, the OS Giken Super Lock LSD transforms the GT86\/FR-S's corner exit performance — the ability to apply throttle earlier and more aggressively out of corners without the inside wheel spinning up is a significant lap time improvement. The consistent power delivery also improves the car's balance and predictability at the limit — allowing the driver to exploit the chassis's natural balance more fully.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrift Application:\u003c\/strong\u003e The GT86\/FR-S is one of the most popular drift platforms globally — and the OS Giken Super Lock LSD is one of the most respected LSD choices for drift use on this platform. The clutch-pack design provides the consistent, locked rear axle behaviour that drift technique requires — predictable rotation initiation, consistent angle maintenance, and reliable power delivery through the rear wheels throughout the drift.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e OS Giken\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e OSGTY421-HA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode:\u003c\/strong\u003e TY421-HA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Super Lock clutch-pack LSD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Toyota GT86 (ZN6) \/ Scion FR-S (ZC6)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 21.7 lbs (shipping weight)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Fluid:\u003c\/strong\u003e OS Giken 80W-250 gear oil (sold separately)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment Information:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eToyota GT86 — ZN6 chassis (2012–2021)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eScion FR-S — ZC6 chassis (2013–2016)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Also verify compatibility with the Subaru BRZ (ZC6) which shares the same platform — confirm OSGTY421-HA fitment for your specific variant. Professional installation by an experienced drivetrain specialist strongly recommended. OS Giken 80W-250 gear oil is required — do not use standard 75W-90 or 75W-140 gear oil in this LSD.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eRequired Fluid:\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eOS Giken 80W-250 gear oil is required for this LSD.\u003c\/strong\u003e The OS Giken Super Lock LSD's clutch pack design requires the specific viscosity and friction characteristics of OS Giken's 80W-250 gear oil for correct engagement, release behaviour, and clutch pack longevity. Using standard 75W-90 or 75W-140 gear oil will result in incorrect LSD behaviour and accelerated clutch pack wear. OS Giken 80W-250 gear oil is available separately at Straight Six Imports.\u003c\/p\u003e\u003ch4\u003eWhat's Included:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOS Giken Super Lock LSD unit — Toyota GT86 \/ Scion FR-S ZN6\/ZC6 (OSGTY421-HA)\u003c\/li\u003e\n\u003cli\u003eRefer to OS Giken's product documentation for complete kit contents\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOS Giken 80W-250 gear oil is not included — must be purchased separately\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eInstallation Notes:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eProfessional installation by an experienced drivetrain specialist strongly recommended — differential replacement requires correct setup procedures including backlash measurement, bearing preload, and correct torque specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOS Giken 80W-250 gear oil is required\u003c\/strong\u003e — do not fill with standard 75W-90 or 75W-140 gear oil. Source OS Giken 80W-250 before installation.\u003c\/li\u003e\n\u003cli\u003eInspect the differential housing, ring gear, and pinion for wear before installation — installing a new LSD into a worn differential housing or with a worn ring and pinion will compromise the LSD's performance and longevity\u003c\/li\u003e\n\u003cli\u003eSet backlash and bearing preload to OS Giken's specified values during installation — incorrect setup will affect LSD engagement characteristics and long-term reliability\u003c\/li\u003e\n\u003cli\u003eFollow OS Giken's recommended break-in procedure after installation — new clutch pack LSD units require a break-in period to correctly seat the clutch plates before full-load use\u003c\/li\u003e\n\u003cli\u003eFollow OS Giken's recommended fluid change interval — competition use requires more frequent changes due to elevated temperatures and clutch pack wear debris accumulation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhy OS Giken?\u003c\/h4\u003e\u003cp\u003eOS Giken is one of Japan's most respected high-performance differential and engine component brands — known for their Super Lock LSD differentials, close-ratio gearboxes, and engine components used in professional motorsport and serious performance applications across Japan and internationally. OS Giken's Super Lock LSD is among the most highly regarded limited slip differentials available for Japanese performance platforms — used by professional racing teams, drift competitors, and serious performance drivers who demand the highest level of differential performance and reliability. 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