The Bel-Ray V-Twin Semi-Synthetic Engine Oil 20W-50 is formulated for superior performance and protection of V-Twin engines. Synthetic blend infused with Extreme pressure (anti-wear additives) for large displacement, V-Twin engines. Lowers engine temperatures and increases horsepower. Extended change intervals. For V-Twin, air-cooled/liquid-cooled 4-stroke engines. API SM/JASO MA2.