Triax Synergy Gear MT 75W-80 GL-4 Full Synthetic Manual Transmission Gearbox Fluid — 1 Gallon, Low-Temp Flow & Yellow-Metal Safe

Built from PAO and ester base stocks with a tailored additive package, this 75W-80 GL-4 fluid delivers consistent viscosity across wide temperature ranges, excellent low-temperature flow, and long service life. It’s formulated to meet or exceed OEM requirements for manual gearboxes, synchromesh units, differentials, and certain transfer cases, while avoiding reactive sulfur chemistry that can harm brass synchros. The result is fast, precise shifting and comprehensive wear, corrosion, and seal protection under mixed driving conditions.

How does this fluid improve shifting performance?

Synergy Gear MT combines friction modifiers with a stable viscosity profile to eliminate notchy shifts and reduce gear grinding. It maintains the correct frictional behavior for rapid synchronization without slipping, which helps achieve smooth, confident gear changes in both cold starts and warmed-up operation.

• Friction modifiers tuned for synchromesh responsiveness
• Stable 204 viscosity index for consistent shift feel
• Arctic-grade pour point (-60°F) for immediate low-temp engagement

Will this protect yellow metals and internal components?

Yes — the formula intentionally excludes reactive sulfurs and includes corrosion inhibitors that safeguard brass synchros, bronze bushings, and other yellow-metal components. The additive package also provides rust protection and seal conditioning to minimize leaks and premature wear.

• No reactive sulfur chemistry to attack yellow metals
• Corrosion inhibitors for long-term metal preservation
• Seal-friendly additives to help prevent hardening or leakage

How durable is the fluid under heavy use and varying temperatures?

TRIAX Synergy Gear MT is engineered for extended drain intervals and strong thermal and shear stability. Its synthetic PAO/ester base stocks resist viscosity breakdown and maintain film strength under high loads and temperatures, while detergency and anti-foam agents help handle contamination and aeration during service.

• High shear stability for prolonged film protection
• Detergency adpack to handle contaminants and maintain cleanliness
• Extreme viscosity stability for consistent protection across temperatures

Which vehicles and applications is this compatible with?

This 75W-80 GL-4 fluid fits a broad range of manual transmissions, synchromesh systems, differentials, and select transfer cases. It’s compatible with many makes that require GL-4 chemistry, including common passenger cars and SUVs, and works well where long drain intervals and yellow-metal protection are important.

• Compatible with Honda, Acura, Toyota, BMW, Audi, Mini, Jeep, Chrysler, Ford, Mercedes-Benz, and more
• Suitable for manual gearboxes, differentials, synchromesh units, transfer cases
• Designed to exceed typical OEM performance for 75W-80 gear oils

Who this is for: Drivers, DIY mechanics, and fleet managers who want a modern full-synthetic GL-4 gear lubricant that prioritizes smooth shifting, extended service life, and protection for brass synchros. It’s especially useful for vehicles that experience cold climates, high-mileage transmissions, or operators seeking longer drain intervals and stable performance under load.