quick view Add to Cart Royal Purple Royal 01300 75W-90 Synthetic Gear Oil MSRP: $14.94 Max Gear is recommended for use in truck and automotive front or rear differentials, manual transmissions and lower gear units of marine engines that specify the use of an API GL-5 or GL-4 fluid. It is non-corrosive to soft yellow metals (brass, bronze,... Add to Cart Add to Wish List Add to My Wish List Create New Wish List Compare