Royal Enfield motorcycles typically use a specific grade and type of engine oil recommended by the manufacturer. The recommended engine oil for Royal Enfield motorcycles is typically a 15W50 grade mineral oil. However, it's important to note that Royal Enfield's specific recommendations may vary depending on the model and the region in which the motorcycle is sold.
To ensure you are using the correct engine oil for your Royal Enfield motorcycle, it is always best to consult the owner's manual or contact an authorized Royal Enfield dealer or service center. They will be able to provide you with the most accurate and up-to-date information regarding the recommended engine oil for your specific Royal Enfield model.