Product Details Bel-Ray EXS Full Synthetic Ester 4T Engine Oil is a premium motorcycle oil that uses the finest quality synthetic hydrocarbon and ester base fluids combined with unique Extreme Pressure, anti-wear additives and shear resistant VI improvers to meet the demands of high-performance applications. Lowers engine temperatures and increases horsepower. Meets the performance requirements of API SN and JASO MA2. Suitable for air-cooled/liquid-cooled 4-stroke engines and wet clutches.