Quote:
Originally Posted by Popfla
Cummins does not recommend the use of Synthetic oil in Onan RV generators as there are no long-term benefits for the additional cost. The best oil you can use for your Onan 4000 generator would be a SAE 30W viscosity oil. Use a 10W40 oil viscosity when changing the oil in your 5500 generator.
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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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