Lucas Primary Chaincase Oil is a blend of easy flowing base oils and a Lucas additive package designed to carry away more heat from the clutch plates and friction plates. This assures a longer more trouble-free clutch life.Expect a smooth clutch action, less slippage, longer chain and sprocket life and a much longer oil life.This product is a heat transfer fluid for the clutch as well as a lubricant for the chain and sprockets.