Quote:
Originally Posted by Pete'sMH
Onan recommends 15W40 conventional oil for their 4000KY and that’s what I use. I was in Texas during the unexpected deep freeze last February and had to start mine in the wee hours of a night during a sleet storm. I’m glad I didn’t have 30W in it!
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What I posted was from Onan's user manual for the 4000 model.