Hi Rich would you mind sharing your Oil info. I'm new to this and have soooo much to readup ... What brand / Specs do you use.
Thanks in advance
Dutch Marc
Any small engine use straight 30W oil. The viscosity enhancers of multi-viscosity oils break down real fast under the conditions inside the Onan. I don't know if there is a straight 30W synthetic. And change the oil every 100 hours of run time like Onan told you to.