Harley Davidson motorcycles have specific recommendations for the type of engine oil to be used in their engines. It is generally recommended to use an oil that meets the specifications outlined by Harley Davidson. While it is possible to put regular motorbike engine oil in a Harley Davidson engine, it is not advisable.
Harley Davidson engines are air-cooled V-twin engines that tend to operate at higher temperatures than many other motorcycle engines. Therefore, they require oils with specific properties to handle the heat and stress associated with these operating conditions. Harley Davidson specifies certain viscosity and additive requirements to ensure proper lubrication, cooling, and protection for their engines.
Using the wrong type of oil, such as regular motorbike engine oil that does not meet the recommended specifications, can potentially lead to engine damage. It may not provide sufficient protection, leading to increased wear, overheating, and reduced performance. It's always best to consult the owner's manual or contact a Harley Davidson dealer or authorized service center to determine the appropriate oil for your specific model and year of motorcycle.