Primary drive oil is an exceptionally high performance, 100% triple synthetic oil with ESTER Propriety molecular polar bonding technology and boosted extreme pressure additives enables the oil to cling to metal parts under extreme conditions Features a protective film increases lubricity, reduces wear, and extends the life of bearings, chains, and sprockets Engineered in mind for use in Big Twin Harley-Davidson primary drives with a wet clutch Provides outstanding grip for wet clutches to help prevent slippage and chatter