ashton23l Posted June 13, 2022 Report Share Posted June 13, 2022 going to change the oil in the onan marquis gold 5500. do i need to stick with onamax? whats the best oil to run here? Quote Link to comment Share on other sites More sharing options...
Larry Burkett Posted June 13, 2022 Report Share Posted June 13, 2022 I have used Castrol SAE 30 oil for years. Quote Link to comment Share on other sites More sharing options...
Ray,IN Posted June 14, 2022 Report Share Posted June 14, 2022 I use the same oil that's in the drive motor. Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
Pat & Pete Posted June 14, 2022 Report Share Posted June 14, 2022 (edited) See the attachment from the 5000 generator manual . Note that any recently stocked oil on the shelves today more than meets requirements . If in doubt check the API classification , run the latest which is "SN" . It replaces all previous classifications . Edited June 14, 2022 by Pat & Pete Quote Goes around , comes around . Link to comment Share on other sites More sharing options...
rickeieio Posted June 14, 2022 Report Share Posted June 14, 2022 I'm a fan of Mobil1, in the approved viscosities. It intrigues me that the temp. range in the chart only goes to 100f. Quote KW T-680, POPEMOBILE Newmar X-Aire, VATICAN Lots of old motorcycles, Moto Guzzi Griso and Spyder F3 currently in the front row Young enough to play in the dirt as a retired farmer. contact me at rickeieio1@comcast.net Link to comment Share on other sites More sharing options...
bobsallyh Posted June 14, 2022 Report Share Posted June 14, 2022 I have used Shell Rotella 15/40 since our Onan Marquis Gold 7000 was new in 2004. Quote Link to comment Share on other sites More sharing options...
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