There are 4 products.
Bel Ray Thumper Racing Synthetic Engine Oil 10W40 Synthetic blend for racing enginesMaximum horsepower and consistent clutch performanceWear protection for valve-trains, rings, cylinders and pistonsFor air-cooled/liquid-cooled 4T engines with wet clutchesAPI SM, JASO MA2
Bel Ray Thumper Racing Synthetic Engine Oil 15W50 Synthetic blend for racing enginesMaximum horsepower and consistent clutch performanceWear protection for valve-trains, rings, cylinders and pistonsFor air-cooled/liquid-cooled 4T engines with wet clutchesAPI SM, JASO MA2
Bel Ray Thumper Racing Synthetic Engine Oil 15W50 Synthetic blend for racing enginesMaximum horsepower and consistent clutch performanceWear protection for valve-trains, rings, cylinders and pistonsFor air-cooled/liquid-cooled 4T engines with wet clutchesAPI SM, JASO MA2
Bel Ray Thumper Racing Synthetic Engine Oil 10W40 Synthetic blend for racing enginesMaximum horsepower and consistent clutch performanceWear protection for valve-trains, rings, cylinders and pistonsFor air-cooled/liquid-cooled 4T engines with wet clutchesAPI SM, JASO MA2