Motul Gear 300 75W90 1L Synthetic Gear Oil — 100% Ester-Based, GL-4/GL-5 Extreme-Pressure Protection

Motul Gear 300 75W90 is a 100% synthetic, ester-based gear oil engineered to deliver extreme-pressure protection, stable viscosity, and smooth shifting for high-performance manual gearboxes and differentials (non-LSD) in a 1 liter bottle.

Built for racing and demanding driving, Motul Gear 300 blends advanced synthetic esters and extreme-pressure additives to protect gears under shock loads, high torque and elevated temperatures while remaining compatible with synchronized gearboxes and brass synchros. The formula resists shear, reduces gear noise, and retains SAE 90 film strength at high temperatures, making it suitable for track, rally and spirited street use where consistent lubrication and long-term durability matter.

How does this oil protect gears during high-load driving?

Gear 300 uses a reinforced EP additive package that forms a tough lubricating film on gear teeth to resist metal-to-metal contact under heavy loads and sudden torque spikes. Its ester base and anti-wear chemistry provide enhanced surface protection versus conventional mineral oils.

• API GL-4/GL-5 rated extreme pressure protection for hypoid gears (non-LSD).
• Shear-stable formulation passes KRL 20-hour shear resistance testing.
• Reduces wear from shock loads and heavy acceleration or braking.

Will this oil keep shifting smooth in cold and hot conditions?

Yes — the synthetic ester base maintains low-temperature fluidity for easier engagement and crisp shifting in cold starts, while preserving SAE 90 viscosity at high operating temperatures to maintain film strength. That balance helps prevent harsh shifts and reduces transmission noise across a wide temperature range.

• Excellent low-temp flow for faster gear engagement on cold mornings.
• High-temp stability prevents viscosity loss under sustained heat.
• Helps lower gear whine and improves overall shift feel.

Is Motul Gear 300 compatible with my vehicle’s components?

Motul Gear 300 is formulated to be safe with modern gearbox materials, including yellow metals like brass used in synchros, and is suitable for synchronized and non-synchronized transmissions, transfer cases, and hypoid differentials that do not use limited-slip clutches. It also provides anti-corrosion, anti-foam, and anti-emulsion properties for reliable long-term performance.

• Compatible with brass synchros and common gearbox materials.
• Designed for manual transmissions, differentials (non-LSD) and transfer cases.
• Includes anti-foam and anti-corrosion additives for system longevity.

How does this oil compare to conventional gear oils for motorsport use?

Compared with mineral-based gear oils, Motul Gear 300 offers superior thermal stability, better shear resistance and stronger EP protection, making it more reliable under race conditions and aggressive driving. The synthetic ester chemistry preserves viscosity and film strength longer, helping components last through repeated high-stress events.

• 100% synthetic ester base for enhanced durability versus mineral oils.
• Maintains protective film under repeated high-temperature cycles.
• Targeted at racing and high-performance applications (non-LSD only).

Who is this for? Motul Gear 300 75W90 1L is aimed at racers, track-day enthusiasts, rally drivers and owners of high-performance manual transmissions who need a shear-stable, extreme-pressure synthetic gear oil that protects under shock loads and high temperatures. It’s ideal when you require a product compatible with synchronized gearboxes and brass synchros, need consistent viscosity retention during intense use, and want to reduce gear noise while improving shift quality. Not intended for limited-slip differentials that require specific friction modifiers.