What oil for a 1986 Honda 4trax 250 4 wheeler?

For a 1986 Honda 4Trax 250, it's recommended to use 10W-40 oil, which is suitable for a variety of temperatures and conditions. You can use either conventional or synthetic oil, but ensure it meets the API service classification of SG or higher. Always check the owner's manual for specific recommendations and to confirm oil change intervals.