THUMPER RACING SYNTHETIC ESTER BLEND 4T ENGINE OIL 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. MEETS API SM AND JASO MA2 REQUIREMENTS. SUITABLE FOR AIR-COOLED/LIQUID-COOLED 4-STROKE ENGINES AND WET CLUTCHES.