I don't know anything about your rv, but I can safely say 5w30 or 10w30 is safe to use and probably recommended. I would use synthetic oil with a quality filter. If your rv history is unknown I would also look at your other fluids like tranny, rear end, radiator, power steering, brake, grease chassis, check belts, hoses, filters, tires, and suspension components. Happy trails.
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USN 1980-2004
2017 Sunseeker GTS 2800
2017 Jeep Grand Cherokee
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