Triax Synergy Gear MT 75W-90 GL-4 Full-Synthetic Manual Transmission Fluid, 1 Gal — Yellow-Metal Safe, Smooth Shifting

TRIAX Synergy Gear MT 75W-90 GL-4 is a full-synthetic manual transmission fluid engineered for smooth shifting, yellow-metal compatibility, and long drain intervals.

Built for modern and classic manual gearboxes, this 75W-90 GL-4 oil delivers friction-optimized performance that helps synchronizers engage cleanly while protecting gears under heavy loads. Formulated without reactive sulfur, it’s safe for brass and other sensitive transmission alloys and designed to minimize sticking, slipping, shudder, and vibration in a wide range of vehicles.

How does this oil improve shifting feel and synchronizer engagement?

TRIAX Synergy Gear MT balances friction characteristics to allow synchronizers to match gear speeds smoothly, reducing harsh engagements and shift effort. The additive package maintains consistent friction over time so shifts stay predictable even after extended service intervals.

• Friction-optimized formulation for crisp, repeatable shifts
• Stabilized friction over long drain intervals to avoid shift degradation
• Prevents gear sticking and reduces synchro wear

Is this fluid safe for transmissions with yellow metal or brass components?

Yes — the blend contains no reactive sulfurs and is explicitly safe for yellow metals, brass, copper, and aluminum alloys used in synchronizers and other internal parts. That compatibility helps prevent corrosion and preserves component fit and function.

• 100% synchro-safe chemistry — no reactive sulfur compounds
• Formulated for compatibility with brass and copper alloys
• Reduces risk of corrosion-related sticking or wear

Can this oil handle high horsepower or demanding driving conditions?

Designed for sustained mechanical and thermal stresses, this full-synthetic fluid delivers reliable gear protection under high torque, high speed, racing, and off-road conditions. It provides robust film strength and wear control to protect gears and bearings in severe service.

• Enhanced gear protection under heavy loads and high temperatures
• Suitable for motorsport and off-road duty as well as street use
• Helps maintain torque transfer and power curve stability

How often should I change TRIAX Synergy Gear MT?

While interval needs vary by application and operating conditions, the fluid is engineered for extended service life and can support drain intervals well beyond typical recommendations in many cases. Always follow your vehicle maker’s guidance and inspect fluid condition if you regularly operate in extreme duty.

• Capable of 100,000+ mile intervals in many driving scenarios
• Monitor for contamination or unusual wear when using extended intervals
• Follow OEM service schedules when required for warranty compliance

Who is this for? TRIAX Synergy Gear MT 75W-90 GL-4 is aimed at enthusiasts, fleet operators, and mechanics who need a high-performance, yellow-metal-safe manual transmission fluid. It’s appropriate for a broad range of vehicles — from commuter cars to high-power builds and off-road rigs — wherever SAE 75W-90 GL-4 is recommended, including many Jeep, Chrysler, BMW, VW/Audi, Ford, GM, Mercedes, Toyota, and Mazda applications.