Newell recommends (see placard in engine room) Mobil Delvac 1 Synthetic 5W40 in the engine and in the generator.
That's what I have always used. I change the oil and filters every 15,000 miles.
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Tuga & Karen Gaidry
1999 Newell 45 w/2 slides
Coach #512
2005 Pilot
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