I need help with doing an oil change on my RV, a 1990 Kountry Star?

I just bought my first RV. It is a 1990 Kountry Star, from Newmar Corp. I'm about to take it across the country for a trip, and I want to do an oil change on it before we leave. I know how to change the oil, but my problem is that I don't know what kind of oil filter I need for the engine, and for the generator. I do know what kind of oil I need for the engine, but I don't know if the generator takes the same kind or not. I have looked online and called around to multiple locations, and have no luck from anyone with any answers, The previous owner stated that he just had a semi-truck shop, through Ford, do all his maintenance for him. Any help or advice would be greatly appreciated, thanks.

I assume you checked with a local RV dealer. Their parts dept should have everything you need. Is it possible to get info from the garage the previous owner used. Generator will not use the same oil as the engine

So you don't know if it is a diesel or gas engine? I'm guessing it is a NEWMAR. NEWMAR made many models. How about giving us a clue.

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