{"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":306.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/3be90d513ea8266da27172edf63e3ebcL_12851cc6-cccd-48f6-a81a-3ad1c514630f.jpg?v=1750353034","url":"https:\/\/www.straightsiximports.com\/en-us\/products\/os-giken-80w-250-gear-oil-1l-1","provider":"Straight Six Imports","version":"1.0","type":"link"}