Royal Purple 06300 75w90 Max Gear Oil Case, 6 Quart, 1 Pack Ultra-tough, high performance Automotive hypoid gear oil to provide maximum protection to heavily loaded gears while maximizing power throughout the drive train Max Gear outperforms ordinary gear oils by combining the highest quality synthetic oils with Royal Purple's proprietarySynerlecadditive technology Makes gears run smoother, quieter, cooler and longer without overhauls A direct reduction of drag in the drive train has huge advantage for trucks and other 4-wheel drive vehicles Formulated with a friction modifier additive - no additional additives are necessary