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Old 11-11-2011, 04:26 AM   #15
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I use synthetic oil in everything Amsoil specifically, engine, differentials,transmission, generators...
Synthetic is more resistant to heat break down has a lower pour point and is worth a couple of miles per gallon in winter.

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Old 11-11-2011, 01:16 PM   #16
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just put rotella-t 15w40 in the genny. still runs!

1999 Winnebago Minnie 29', Ford V10, Close to stock.
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Old 11-11-2011, 01:25 PM   #17
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Originally Posted by W4MBG View Post
just put rotella-t 15w40 in the genny. still runs!
That is what I use in my diesel as well as my former gas Onan. Never had a problem.

Don & Bev Morgan Weyauwega WI, 05 Itasca Horizon 40KD, 400 HP Cummins, Delorme GPS LT 40, Toad 07 Saturn Vue AWD, Air Force One, TST 510 TPMS, Mayor of Weyauwega 2007 - 2013, Waupaca Co Board Supervisor 2010 - 2014
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Old 11-11-2011, 11:02 PM   #18
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all of these answers seem fine (except the one that says Cummins says to use diesel lube oil in your gasoline-powered generator, which is untrue), but the best answer, as usual, is ... to read the manual, which says, on page 6, to use API class SJ, SH, or SG engine oils (all S class oils are for gasoline engines). However, since some high-quality oils, like Rotella, are certified both for gasoline and diesel (API class C oils), you can use them with no problem.
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Old 11-12-2011, 12:31 AM   #19
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I have always used chevron delo 400 but have noticed no one seems to use it. I tried rotella once in my dodge but didn't care for the smell. Have I been missing something?
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Old 11-12-2011, 04:29 AM   #20
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Am I the only one using Mobil 1? Is there something I should know?
Foothills of the Smokies
2005 Bounder 35E
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Old 11-12-2011, 06:46 AM   #21
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Thanks for all the replys. I called Onan and spoke with a tech. I was told the following. For my gas generator the correct weight oil is 15W40. He did not recommend diesel oil. He said I could use synthetic oil if I wanted to or just stick with dino oil. His bottom line was to use a high quality 15W40 synthetic blend and always exercise the generator once a month under a load. I'm going to follow his advice.

Thanks again,
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Old 11-12-2011, 07:57 AM   #22
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If mine I'd use 5W-40 synthetic Rottela. That is What mostpeople use as a replacement for trucks where they use 15W-40 dino oil.
I've never heard of a problem with this.

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