Mag 1, QT, 75W90 full synthetic gear oil, provides superior gear protection for a wide variety of applications including hypoid gears, manual transmissions, gear boxes, passenger car and light truck conventional differentials, transmissions, and steering gears. API GL-5 and MT-1, Mack GO-J, SAE J2360, limited slip. Formulated with synthetic base oils, premium extreme pressure additives, rust preventatives, and anti-foam agents.