BelRay Thumper Racing Synthetic Ester Blend 4T Engine Oil 15W50 4LLuicant Selector 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
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