Motul Gear Competition 75W-140 Full Synthetic Gear Oil – 1 Litre

Motul Gear Competition 75W-140 is a 100% synthetic racing gear oil based on Motul's Ester Technology — engineered for hypoid differentials with limited slip systems, gearboxes with integrated limited slip differentials, mechanical transmissions, and transfer cases operating under the extreme conditions of motorsport and high-performance driving. The 75W-140 viscosity grade provides a thick, high-film-strength oil layer at operating temperature — critical for protecting gear and differential surfaces under the heavy loads, shock loading, and high temperatures that performance and competition applications generate — while remaining fluid enough at low temperatures for comfortable gear shifting from cold. For performance and competition vehicles where the factory gear oil specification is insufficient for the loads and temperatures the drivetrain is subjected to, Motul Gear Competition 75W-140 is the correct upgrade.

Key Features:

• 100% synthetic — full synthetic formulation based on Motul's Ester Technology for superior film strength, thermal stability, and oxidation resistance compared to mineral and semi-synthetic alternatives
• Ester Technology — Motul's proprietary ester-based additive system provides exceptional lubrication under extreme pressure, high temperature, and shock loading conditions — the technology that differentiates Gear Competition from standard synthetic gear oils
• 75W-140 viscosity — high-viscosity grade for maximum film strength at operating temperature — correct for hypoid differentials, LSD units, and transmissions operating under heavy loads and elevated temperatures
• API GL-5 rated — meets API GL-5 specification for hypoid gear lubrication under severe service conditions
• LSD compatible — formulated for use in limited slip differentials and gearboxes with integrated LSD units — correct friction characteristics for LSD clutch pack operation
• 0% shear loss — unshearable oil film in extreme conditions — the viscosity grade is maintained under the high shear forces that gear and differential systems generate, ensuring correct film thickness throughout the service interval
• Cold temperature fluidity — fluid at low temperatures for comfortable gear shifting from cold despite the high 140 hot viscosity grade
• 1 litre packaging — single litre for precise fluid quantity management in differential and transmission service

Technical Performance:

• Ester Technology: Motul's Ester Technology uses synthetic ester base stocks — polar molecules that adhere strongly to metal surfaces, forming a tenacious lubricating film that resists being squeezed out from between gear teeth and differential components under extreme pressure and shock loading. Ester base stocks provide superior film strength compared to PAO (polyalphaolefin) synthetic base stocks alone — making Gear Competition the correct choice for applications where maximum gear and differential protection under extreme conditions is the priority.
• 0% Shear Loss: Gear oils in high-shear applications (hypoid differentials, LSD units, high-speed transmissions) are subject to viscosity loss through mechanical shear — the oil's polymer chains are broken down by the shearing action of gear teeth, reducing the oil's effective viscosity below its rated grade. Motul Gear Competition's formulation is engineered for 0% shear loss — maintaining the full 140 hot viscosity grade throughout the service interval, ensuring correct film thickness and protection from the first use to the last.
• 140 Grade Hot Viscosity: The 140 hot viscosity grade provides outstanding oil film resistance at elevated operating temperatures and under heavy loads — correct for hypoid differentials and LSD units where gear geometry generates high sliding contact pressures that require a thick, high-film-strength oil layer for adequate protection. The 140 grade also helps reduce transmission noise in applications where gear noise is a concern at operating temperature.
• Cold Temperature Performance: Despite the high 140 hot viscosity, Gear Competition's 75W cold viscosity rating ensures adequate fluidity at low temperatures — allowing comfortable gear shifting from cold without the stiff, resistant feel that high-viscosity gear oils can exhibit in cold conditions.

Specifications:

• Brand: Motul
• SKU: 105779
• Base Oil: 100% synthetic — Ester Technology
• Viscosity Grade: 75W-140
• API Standard: API GL-5
• Volume: 1 litre
• Packaging: Also available in 20L jerrican for bulk applications

Recommended Applications:

• Hypoid differentials with limited slip systems (LSD) — including Torsen, clutch-pack, and helical LSD units in performance and competition vehicles
• Gearboxes with integrated limited slip differentials
• Mechanical transmissions — synchronised and non-synchronised — operating under heavy loads and shock loading
• Transfer cases operating under heavy loads, low revolution speed, or moderate loads at high revolution speed
• Performance and competition vehicles where the factory gear oil specification is insufficient for the loads and temperatures the drivetrain is subjected to

Usage Notes:

• Verify that 75W-140 viscosity is the correct specification for your differential or transmission before use — some differentials and transmissions specify a lower viscosity grade (75W-90, 80W-90) and using a higher viscosity than specified can affect shifting feel and differential operation
• Verify LSD compatibility with your specific LSD type before use — some LSD units require a specific friction modifier additive that may or may not be present in Gear Competition — consult Motul's application guide or contact Straight Six Imports for guidance
• Follow the manufacturer's recommended fluid change interval for your differential or transmission — competition use typically requires more frequent fluid changes than street use due to elevated operating temperatures
• 1 litre packaging — verify the fluid capacity of your differential or transmission before ordering to ensure you purchase the correct quantity

Why Motul?

Motul is a French lubricant brand with over 160 years of history and a strong motorsport pedigree — known for their 100% synthetic engine oils, gear oils, and specialty lubricants used in Formula 1, Le Mans, World Rally Championship, and a wide range of other motorsport disciplines. Motul's Gear Competition line represents their highest-performance gear oil formulation — developed for the extreme conditions of motorsport competition and validated in the most demanding drivetrain applications in the world. For performance and competition vehicle owners who want a proven, motorsport-grade gear oil for their differential and transmission, Motul Gear Competition 75W-140 is the correct choice.

Perfect For:

• Performance and competition vehicles with hypoid differentials and LSD units where the factory gear oil is insufficient for the loads and temperatures generated in spirited street or track use
• Differential and transmission fluid changes on performance builds where maximum gear protection, LSD compatibility, and 0% shear loss are priorities
• Motorsport applications — circuit racing, rally, drag racing, and time attack — where drivetrain reliability under extreme conditions is critical
• Owners who want Motul's Ester Technology and motorsport-proven formulation in a 75W-140 viscosity for their specific differential or transmission specification

Note: Verify 75W-140 viscosity is correct for your differential or transmission specification before use. Verify LSD compatibility with your specific LSD type. Follow manufacturer's recommended fluid change interval — more frequent changes recommended for competition use. 1 litre — verify fluid capacity before ordering.