Harley-Davidson recommends using the appropriate type and grade of oil that meets their specifications for their motorcycles. The recommended oil types may vary depending on the specific model and engine. Synthetic motor oils, when used according to the manufacturer's recommendations, can provide enhanced lubrication and performance compared to conventional oils.
While synthetic motor oils can offer several benefits, such as better thermal stability and resistance to breakdown, it is important to follow the oil change intervals specified by Harley-Davidson. The frequency of oil changes can depend on factors like riding conditions, climate, and usage patterns.
As long as the motorcycle is properly maintained and the recommended oil change intervals are followed, synthetic motor oils can typically perform well in Harley-Davidson motorcycles without any problems such as leaks or excessive smoke. However, it's essential to refer to the specific recommendations in the owner's manual or consult with a certified Harley-Davidson dealer to ensure that you're using the correct type of oil and following the appropriate maintenance schedule for your particular motorcycle model.