Silkolene Light Gear Oil Advanced gear oil for wet or dry clutch transmissions. Reduces drag, combats clutch slip and protects highly stressed components. SAE 75W-80. Crankcase rating SAE 10W- 40.GL3 / GL4 Motorcycle applications only SAE 75/SAE 80. Not suitable for hypoid applications. SAE 75W-80 Gearbox rating. SAE 10W-40 Crankcase rating. 1L Bottle.