Valvoline 4-Stroke Motorcycle SAE 20W-50 Full Synthetic Motor Oil provides the ultimate wet clutch, transmission and engine protection for high performance 4-stroke motorcycles, cruisers and off-road bikes. Our anti-friction formulation is specifically designed for the extreme temperatures and high RPMs of 4-stroke motorcycles, meeting or exceeding all specifications set by the Japanese Automotive Standards Organization (JASO) and the American Petroleum Institute (API). It provides outstanding wet clutch protection and helps prevent slippage to ensure smooth shifting and optimal power transfer. While advanced additives safeguard against deposits, corrosion and oil thickening that can decrease performance and longevity. No wonder motorcycle owners and race teams around the world rely on Valvoline, the trusted motor oil brand for over 150 years.