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Old 06-01-2014, 09:25 PM   #1
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Generator Oil

I know the general consensus on diesel oil is dino and I conform to that using Shell Rotella in my Cat 3126B engine. However, I'm curious if there is any advantage to using synthetic oil in the generator. I have an Onan 7500 Quiet diesel and was wondering if I might extend the hours between oil changes using synthetic oil. I'm looking for feedback.


2001 Cruisemaster/300 Cat/2011 Hyundai Elantra Touring/Acme Tow Dolly
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Old 06-01-2014, 09:31 PM   #2
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The mfgrs. recommendation is to change the generator oil on the number of hours operated, regardless of type, just like your engine. Synthetic oil does not make any difference to them. Additives wear out at the same rate, whether in dino or synthetic oil. This old thread may be of interest: Synthetic lubricants-Aren't???

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Old 06-01-2014, 09:35 PM   #3
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Cat & Cummins say synthetic is acceptable , BUT, both say not to extend the rec-commended service intervals by using synthetic oils.
Onan, being a Cummins subsidiary will probably say the same.
Main advantage , per the manuals, is cold weather performance of the synthetic over dino.
JM2CW. Stick with the dino and change on schedule. It's only 3 quarts.
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Old 06-01-2014, 11:00 PM   #4
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I just use the Onan oil in the jenny...
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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Old 06-02-2014, 04:49 PM   #5
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Yes, change the oil at least anually, no matter what.
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Old 06-02-2014, 05:41 PM   #6
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Use the same oil you use in your cat. Then you only carry one oil for top offs. I run Delo in everything, even my lawn mower .

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