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 today"s 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. Forall 4-stroke engines rated forAPI SG/SH/SJ/SL/SM Meets API SM and JASO MA2 requirements For4-stroke motorcycles with or without wet clutches Controls sludge and varnish formation Reduces cylinder and ring wear Prevents clutch grabbing and aids smooth power transfers 4 Liter(4 per case)