What oil should you use in a 1997 Yamaha timber wolf?

For a 1997 Yamaha Timber Wolf, it is recommended to use 10W-40 oil for the engine. Ensure that the oil meets the API (American Petroleum Institute) classification of SG or higher. For the gearbox, you can use a gear oil like 80W-90 or a specific ATV gear oil as per Yamaha's recommendations. Always check the owner's manual for any specific guidelines.