Features: - Bel-Ray Thumper Racing Synthetic Ester Blend 4T Engine Oil is a 4-stroke motorcycle racing oil that combines the finest quality synthetic esters and highly-refined mineral base oils specifically engineered for todays 4-stroke single cylinder, multi-valve racing engines - Provides maximum anti-wear protection for valve-trains, rings, cylinders and pistons - Delivers maximum horsepower while providing consistent clutch performance - Meets API SM and JASO MA2 requirements - Suitable for air-cooled/liquid-cooled 4-stroke engines and wet clutches