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By very nature air cooled engines have bigger clearances than a water cooled engine. I don't consider synthetics due to expense in this application. Neither the RV Onan or the trailer mounted Champion have required oil addition between changes yet. The Onan get changed every 125 hours due to not getting used much. The Champion on trailer gets changes much more frequently as on a race weekend it will run through night on Friday then after fillup and oil check it will run into Saturday night. If we are still in late, it get another fill and oil check then run into Sunday morning. For $300 the Champion is a killer deal, it goes 12 to 16 hours on 3.5 gallons of gas. It only holds 5/8 quart and I get many changes out of a gallon of Rotella 15W-40 for $12.97 at Walmart. I do tend to keep oil clean by changing frequently.
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