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Old 05-23-2020, 12:32 PM   #1
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Generator oil preference

I don't want to start another dreaded oil thread, but need just a bit of info. For servicing my Onan 7.5K QD genset I thought I'd use Rotella oil because I'm familiar with it. 15w40 T5 appears to be a synthetic blend, while T6 is full synth. I can get T5 by the gallon, but T6 seems to only be available in 3-gallon packages, which isn't very practical.


I'm curious what others use and prefer. I use Mobil 1 in my street/track FRS, but don't know anything about using it in a diesel.
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Old 05-23-2020, 12:43 PM   #2
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I use T4, 15/40. Same as in my engine.. Change once a year. 1100 hrs and never have to add a drop.
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Old 05-23-2020, 01:14 PM   #3
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Mobile One markets a heavy duty diesel full synthetic. Not sure if Cummins recommends using the synthetic for the Onan. Reference the owner's manual to clarify.
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Old 05-23-2020, 01:21 PM   #4
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I use the same oil as i use in the motorhome engine Delo 15x40
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Old 05-23-2020, 01:51 PM   #5
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I always used the same as the coach diesel, mostly because it was convenient. I changed both engine oils annually, so typically used Rotella T4 or T5. One in awhile Delo or other quality brand of 15W40 if I hit a sale somewhere. 1800 hours on the Onan 7500.
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Old 05-23-2020, 02:01 PM   #6
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Rotella T4 15W40 in my Cummins. I buy it from Sam's Club. They carry a 6 - one gallon jug case. It's regularly $88 but goes on sale often for $68.
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Old 05-23-2020, 04:07 PM   #7
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I use T4, 15/40. Same as in my engine.. Change once a year. 1100 hrs and never have to add a drop.

OK...Customer service at Onan told me change every 150 hours. I haven't had one of these gensets in 20 years, but I think that's the interval I used to follow, Maybe I was wasting time and money.
I was going to order the parts and oil on Amazon today, but think now I'll wait till Tuesday and talk to them again abut using synthetic. This forum is a great resource.
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Old 05-23-2020, 04:17 PM   #8
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I use rotella 15-40 in genny and engine . I believe your genny holds 3 quarts with new filter.
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Old 05-23-2020, 04:35 PM   #9
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Same, same--use Valoline 15-w40 in the Cummins and the Onan....makes it easy to buy/carry just one oil.....17 years and 1700 hrs on my QD7500, annual oil and filter change, doesn't/hasn't used any oil between changes.....
PS -- also use Fleet Guard Complete coolant in Onan, same as Cummins.....so buy/carry just one coolant too....
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Old 05-23-2020, 04:54 PM   #10
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I'd like to offer an opinion: It is better to stay with the same brand and type than to switch around (unless, maybe, you really know your oil stuff). Different brands of oil had different characteristics and once in a while following Brand X with Brand Y can be a mistake. Illustration: Way back when I was driving a nice 1970 Ford Galaxy with the 390 engine, and using Quaker State -- very high ash content, and as the engine wore the ash content built up and kept it sealed well enough not to need oil between 4,000 mile changes and be a quart down at change time. Once couldn't get the QS and got Valvoline, which has a very high detergent content which washed out all the ash deposit and suddenly I was down to under 900 miles to a quart -- within a thousand or so miles. I drained the nice new Valvoline and resumed with QS, and by the time I traded the car I was up to 1200 miles/quart and still slowly climbing. That taught me to stay with a premium brand and not change it. I get well over 150,000 on my gasoline engine vehicles before trading and they still don't burn oil.
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Old 05-23-2020, 05:14 PM   #11
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Quote:
Originally Posted by Qwimby1 View Post
T6 seems to only be available in 3-gallon packages, which isn't very practical.
You can get it easy by the gallon. Best price is at Walmart also by about $8 a gallon.

https://www.walmart.com/ip/Shell-Rot...llon/869812640
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Old 05-24-2020, 06:25 PM   #12
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Quote:
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....I use T4, 15/40. Same as in my engine....
Same here, makes it easy.
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Old 05-24-2020, 06:40 PM   #13
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Same here, makes it easy.
I went to WalMart to get some today, but turned around and ran out. Huge mob with few masks and most not practicing spacing, as though no one had heard of the virus. My Walmart in Sarasota appeared tohave little if any crowd control. I'll get it on Amazon even if I have to wait a day.
Thanks for all the tips here. I'll go with T4 15x40 and regular Prestone 50% mix.
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Old Yesterday, 06:46 AM   #14
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I went to WalMart to get some today, but turned around and ran out. Huge mob with few masks and most not practicing spacing, as though no one had heard of the virus. My Walmart in Sarasota appeared tohave little if any crowd control.
WOW. Like Forrest Gump said about that box of chocolates , Ya never know what your going to get inside. Our Walmart is clean neat and well laid out always has what they show on line before ya even go. 2 towns over is always trashy looking and on 2 trips didn't have what they said was in stock on line.
Walmart. Ya just never know. LOL
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