Gear oil is a heavier-viscosity lubricant formulated for the high-pressure, metal-on-metal contact inside differentials, transfer cases, and manual transmissions — conditions standard motor oil isn't built to handle. Low or degraded gear oil is a common cause of whining or grinding noises from the differential, harder shifting in a manual gearbox, and accelerated wear on gears and bearings. Browse conventional and synthetic gear oil in a range of weights for cars, trucks, and SUVs to keep your drivetrain properly protected.
