The duration or distance that fully synthetic engine oil lasts in Royal Enfield motorcycles can vary depending on several factors, including the specific model, riding conditions, maintenance practices, and the type of synthetic oil used. It's important to consult the motorcycle's owner's manual and follow the manufacturer's recommendations for oil change intervals.
Typically, fully synthetic engine oils have extended oil change intervals compared to conventional oils. Some manufacturers may suggest oil change intervals of around 8,000 to 10,000 kilometers (5,000 to 6,000 miles) or even longer for motorcycles using fully synthetic oil.
Royal Enfield provides oil change recommendations in their owner's manuals, which can vary depending on the specific model and engine type. It is recommended to refer to the owner's manual or contact a Royal Enfield authorized service center to get accurate information about the recommended oil change intervals for your particular Royal Enfield motorcycle model. They can provide the most up-to-date and accurate guidance based on the specific requirements of your motorcycle.