Genuine Harley-Davidson® H-D 360 Motorcycle Oil - SAE 20W50. Harley-Davidson Motorcycle Oil is developed and tested exclusively for use in Harley-Davidson motorcycles. Our unique additive package helps prevent engine wear and helps keep your engine cooler, cleaner, free of sludge, varnish and corrosion. Harley-Davidson air-cooled V-Twin motorcycles operate at higher temperatures than water-cooled engines, thus a specific high temperature additive package is necessary to protect the engine. Be assured, H-D 360 Oil can be trusted in a Harley-Davidson engine. Refer to your Harley-Davidson owner's manual for the proper SAE grade recommendation based on the climate and temperature range you ride in.