Motul Gear 300 75W90 Synthetic Gear Oil 1L — Ester Base, EP Protection

Motul Gear 300 75W90 is a 100% synthetic, ester-based gear oil engineered to deliver extreme-pressure protection, durable unshearable film strength, and smooth shifting for high-performance manual transmissions and non-LSD differentials.

Built for racing and aggressive street use, this one-liter formulation combines high-temperature stability with excellent low-temperature fluidity. It meets API GL-4/GL-5 performance levels and is designed to protect gears under heavy loads, resist viscosity loss from mechanical shear, and remain compatible with brass synchros and modern gearbox materials. Motul Gear 300 is intended where high torque, shock loads, and rapid cycling demand a robust lubricant that won’t thin out or create excessive gear noise.

How does Motul Gear 300 protect gears during track and racing use?

Motul Gear 300 contains extreme-pressure (EP) additives and an ester synthetic base that form a resilient lubricating film. This film resists wear, handles shock loads, and reduces the risk of micro-welding on hypoid gear teeth under severe conditions.

• API GL-4 / GL-5 rated EP formulation for heavy-load protection
• Unshearable film confirmed by KRL 20-hour shear testing
• Maintains SAE 90 viscosity at high temperatures for consistent film strength
• Reduces gear tooth wear and improves component longevity under stress

Will it improve shifting and performance in cold weather?

Yes — the 75W rating provides good low-temperature flow to shorten shift times and reduce resistance on cold starts. That means easier gear engagement for synchronized gearboxes and smoother driver control in cooler climates.

• Excellent low-temperature fluidity for quicker gear selection
• Supports synchronized and non-synchronized transmissions
• Helps prevent shift-related wear during cold operation

Is Motul Gear 300 compatible with my gearbox materials and limited-slip systems?

Motul Gear 300 is formulated to be safe for yellow metals such as brass synchros and for modern gearbox materials, with additives to limit corrosion, foaming, and emulsification. However, it is specifically recommended for non-LSD differentials; do not use it where limited-slip friction additives are required.

• Compatible with brass synchros and common gearbox alloys
• Anti-corrosion and anti-foam properties for long-term reliability
• Not intended as a limited-slip differential fluid—avoid LSD applications

How does this oil handle long-term durability and high-temperature stability?

The synthetic ester base and robust additive package resist thermal breakdown and mechanical shearing, preserving viscosity and protective film thickness during extended high-load runs. This stability reduces maintenance frequency and helps control gear noise by keeping film strength consistent.

• High-temp stability keeps oil within SAE 90 viscosity range under heat
• Resists mechanical shear for predictable performance over time
• Helps minimize transmission noise during heavy or sustained use

Who is this for? Motul Gear 300 75W90 is aimed at racers, performance drivers, and enthusiasts who run manual transmissions, transfer cases, or hypoid differentials (non-LSD) under high loads or aggressive conditions. Select this oil if you need a fully synthetic, unshearable gear lubricant that retains film strength at high temperatures, improves cold shifting, and is compatible with brass synchros and modern gearbox materials. If your vehicle requires a friction-modified LSD fluid, choose a product explicitly labeled for limited-slip systems instead.