75w90 Synthetic Gear Oil 1 Qt

The Lucas Oil 75W90 Synthetic Gear Oil is designed for serious vehicle builders and mechanics who require dependable protection in high-stress drivetrain applications. This 1-quart bottle provides premium synthetic lubrication for rear differentials, transfer cases, and manual transmissions in trucks, SUVs, and performance vehicles.

With a viscosity rating of 75W90, this gear oil ensures cold-start flow characteristics typical of a 75-weight oil while offering 90-weight protection under highway and track temperatures. Its synthetic formulation is engineered to resist breakdown from shear forces, oxidation, and extended service intervals, making it ideal for modified gearing and aggressive driving. The inclusion of anti-wear additives and friction modifiers helps reduce churning losses and protects critical components.

This product is perfect for truck owners, off-road enthusiasts, and performance builders working on lifted suspensions or regeared axles. It is suitable for use in rear differentials (both open and limited-slip), transfer cases in 4WD systems, and manual transmissions where OEM GL-5 or GL-6 specifications are required.