Bel-Ray V-Twin Synthetic 10W50 Engine Oil 4 Liter 96915-BT4 &nbsp;Synthetic ester infused with Extreme Pressure (anti-wear additive) for large displacement V-Twin engines &nbsp;Lowers engine temperatures and increases horsepower &nbsp;Longest change intervals &nbsp;For V-Twin, air-cooled / liquid-cooled 4-stroke engines API SM, JASO MA2