For the Royal Enfield Bullet 500, it is recommended to use a 15W50 grade engine oil. Royal Enfield itself recommends using their own branded engine oil, the Royal Enfield 15W50 Oil. This oil is specifically formulated for Royal Enfield motorcycles and provides the necessary lubrication and protection for the engine.
Look for engine oils that meet the required specifications and are suitable for motorcycles with air-cooled engines. Always refer to the owner's manual or consult with a Royal Enfield service center for specific oil recommendations and any updates from the manufacturer.
It's important to follow the manufacturer's recommendations and change the engine oil at the recommended intervals to maintain optimal engine performance and longevity. Regularly check the oil level and ensure it is within the prescribed range to ensure proper lubrication of the engine.