Onan BFA Oil - Why not 20W-50?
Note: Our typical camping climate range runs from 10F to 115F (if we go to Redding, CA in the summer... otherwise up to about 105 in Southern Oregon.) Clearly Onan/Cummins have updated their recom...
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I am a believer in 5W-40 Rotella syn for this application. Great specs and available everywhere. Since the widespread availability of synthetics it's been my practice to go with a multigrade for air cooled engines.
