Red Line 42904 V-Twin Primary Oil, 1 Quart, 1 Pack For 1984-to-present V-Twin American motorcycle engines, including Evolution, Twin Cam, and aftermarket engines of similar design Improves clutch operation while reducing wear and temperature This product is for use in the primary chaincase with wet-diaphragm spring clutches. Perfect for Motorcycles, ATVs, and Powersports