Onan 5500 Marquis Gold, OIL?
My Onan 5500 Marquis Gold in my 2006 Class'A' MoHOme has almost 500 hours on it. I'm still using the 15W-40 grade of oil that was originally recommended in the manual. Should I start using a different...
Forum Discussion
jolooote wrote:My onan book shows that but also shows 30w....it lists several types based on temp. Just wondering why all RV'ers seem to go with 15w-40. This is what the book says:
My 2005 Onan book says 15W-40
Single grade SAE-30 is preferable when temperatures are consistently above freezing. Multigrade oils are better when wide temperature variations are expected.
So, perhaps this is just an interpretation thing? I don't really operator my generator below freezing. Other than monthly testing during the cooler months, the generator isn't used at all until it is time for air conditioning.
