aunut Posted September 25, 2022 Report Share Posted September 25, 2022 I am going to change oil in my 5500 Onan gas genset. The Onan 15w40 oil, which I have always used, is now priced higher than synthetic. I went to a local auto parts store and they have 15w40 Rotella T4 for half the price of the Onan oil. Is this ok to run in my gen? Quote 2014 Winnebago Vista 35B Class A. 2010 Honda CR-V. Link to comment Share on other sites More sharing options...
pjstough Posted September 25, 2022 Report Share Posted September 25, 2022 Here is a good video on selecting the best oil for an Onan generator. Quote 2005 Winnebago Voyage 38J Link to comment Share on other sites More sharing options...
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