The viscosity improvers found in multi-weight oils tend to break down faster in the DD 2 cycle engines. I would not run it over 2000 miles before changing. Robert, if you could insert the pertinant info about your coach into your signature line it will help us help you with more accuracy.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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