What type of oil for 660 grizzly engine?

For a Yamaha Grizzly 660 engine, it is typically recommended to use 10W-40 or 20W-50 engine oil, depending on the operating temperature and conditions. Always opt for high-quality petroleum or synthetic oil that meets the API service classification of SG or higher. It's essential to check the owner's manual for specific recommendations and maintain proper oil levels for optimal performance.