We are in our 5th year. Our generator has 500 hours on it. The Champion on racecar trailer is likely over 5000 hours. Oil change interval is annual or 150 hours, bought it woth just under 200 hours. I have yet to change Onan oil from hours, only time. The champion gets changed every 6 months.
I do same with v10. It has only been changed twice due to miles.
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