Yes, it is generally acceptable to use synthetic oil in older Harley-Davidson motorcycles. In fact, many riders choose synthetic oil for its superior lubrication properties and potential performance benefits. Synthetic oils offer improved high-temperature stability, better resistance to breakdown, and enhanced protection against engine wear.
While most modern Harley-Davidson motorcycles are compatible with synthetic oil, some older models may have specific recommendations or requirements.
Leaks: If your motorcycle has been running on conventional oil for a long time, switching to synthetic oil might reveal or exacerbate existing gasket or seal leaks. Synthetic oil has different characteristics and can flow more easily, potentially increasing the visibility of leaks. It's advisable to monitor for any leaks after switching to synthetic oil and address them if necessary.
Oil Change Intervals: Synthetic oil generally has a longer service life compared to conventional oil. However, it's still important to adhere to the manufacturer's recommended oil change intervals specified in your motorcycle's owner's manual. The manual will provide guidance on the appropriate oil change frequency for your specific model and usage.
Cost: Synthetic oil tends to be more expensive than conventional oil. Consider the additional cost when deciding whether to use synthetic oil in your motorcycle. While synthetic oil may offer certain benefits, it's important to assess whether those advantages outweigh the increased expense.
In summary, as long as your older Harley-Davidson motorcycle is compatible with synthetic oil, you can use it. Synthetic oil can provide improved lubrication and protection, but it's important to monitor for leaks and adhere to the recommended oil change intervals. If you have any doubts or questions, consult your motorcycle's owner's manual or seek advice from a Harley-Davidson dealership or qualified mechanic.