Castrol 06116 POWER1 V-TWIN 4T 20W-50 Synthetic Motorcycle Oil, 1 Quart Bottle, 6 Pack Engineered and tested to ensure performance in Harley-Davidson Motorcycles Full synthetic formulation provides excellent oil flow over a wide temperature range Provides excellent protection against thermal and viscosity breakdown at higher temperatures generated by air cooled, V-Twin engines Delivers proven wet clutch performance for smooth operation and advanced protection Exceeds Specifications API SL, JASO MA-2 Suitable for all Japanese and North American 4-stroke motorcycles where SAE 20W-50 is recommended. Always follow the vehicle manufacturers recommendations