The Lucas Oil Heavy Duty High Performance SAE 85W-140 Gear Oil is a superior lubricant designed to provide superior protection and performance in heavy duty and high-performance applications. This oil is formulated with unique anti-wear and lubricity compounds to help regulate heat and reduce wear on gears and other components. It is an excellent choice for use in manual transmissions, differentials and transfer cases. FleetPride is your First Click in Heavy Duty®.