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08-19-2011, 06:41 AM
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#1
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Winnebago Owner
Join Date: Apr 2005
Location: FL
Posts: 201
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Onan Generator oil
What type and weight of oil to use in Onan Generator?
Thanks,
Ron
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2002 32' Adventurer 8.1 Workhorse no toad
Our 2 Girls,Sweetie Pie & Shadow
Florida
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08-19-2011, 06:50 AM
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#2
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Winnebago Camper
Join Date: Jul 2009
Location: Boerne, Texas
Posts: 17
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I posed this question one time to our RV tech and he said they use Rotella 15/40, the same as we use in the engine. He did say that we should probably use the Onan brand oil during the warranty period, but it really didn't matter.
Don
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2009 Newmar 42 ft. Allstar 4188, Wheelchair Accessible, 400HP Cummins ISL, Allison 3000, Mastertow Dolly, '98 Riviera
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08-19-2011, 06:52 AM
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#3
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Registered User
Join Date: Oct 2009
Posts: 437
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You need to be more specific We've had onans I used a good grade of 10X40 in them over 2000 trouble free hours.Have the onan 7.5K onan diesel Use Cheveron diesel, Or Shell or Mobil All diesel oil. I say the best you can do is get a multi grade Good oil you like put it in and that is the best;;
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08-19-2011, 07:18 AM
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#4
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Winnie-Wise
Join Date: Jan 2006
Location: Hickory, NC
Posts: 419
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I'm pretty sure there is a label on the cover that gives weights for different operating conditions. There is one on my 5.5.
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Hickory, NC. 2007 Fleetwood Discovery 40X
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08-19-2011, 09:06 AM
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#5
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Winnie-Wise
Join Date: Oct 2002
Location: Madison, MS
Posts: 450
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Quote:
Originally Posted by Ron & Dee
What type and weight of oil to use in Onan Generator?
Thanks,
Ron
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Rather than taking advice from those of us who don't KNOW what genset you have.....I suggest you get the model and "spec letter" info off the label on yours and look here: Cummins Onan
I do know that gas and diesel units have a different oil requirerment. I use straight 30 HD in mine.
Ed
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2016 EC Aspire 42RBQ / 2014 CR-V
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08-19-2011, 09:32 AM
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#6
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Winnebago Master
Join Date: Nov 2005
Posts: 1,080
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Quote:
Originally Posted by Ron & Dee
What type and weight of oil to use in Onan Generator?
Thanks,
Ron
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The Adventurer came with an Onan 5500 watt HGJAB generator. 15W-40 oil is recommended for temps 10*F to 100*F. You can use 30W iol if you are in areas where temps don't go below 32*F. For temps 0*F to 80*F you can use either 10W-30 or 10W-40. For temps of -20*F to 50*F 5W-30 is recommended.
All these specs are available from the operators manual available from the Cummins site at:
http://www.cumminsonan.com/manuals
They also have parts, service, and installation manuals. I have all of them, but the service manuals aren't of much use to the average consumer unless you have the recommended special tools. Several of the diagnostic trees rely on use of special tools. They assume the manuals will be used by people with those tools so they don't give many details on how to make problem diagnosis without them
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Hikerdogs
2013 Adventurer 32H
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08-19-2011, 09:55 AM
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#7
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Winnebago Owner
Join Date: Apr 2005
Location: FL
Posts: 201
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Thanks for the reply.
I have the Onan 5.5 and I needed a quick oil change for an upcoming trip.
I think I'll go with the 30 weight heavy duty.
Ron
__________________
2002 32' Adventurer 8.1 Workhorse no toad
Our 2 Girls,Sweetie Pie & Shadow
Florida
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08-21-2011, 07:38 PM
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#8
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Winnebago Owner
Join Date: Oct 2002
Posts: 137
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If you haven't changed it yet, you might consider Shell Rotella 5W-40 synthetic which protects you from below 0-over 100*F. I don't know about you, but I run my generator in temps greater than 80*.
I am a fanatic about synthetics, and know that they work. I would use Mobil 1 10W-30 if I knew I was protected to 100*+. I have used the Rotella since new, and now have 300+ hours on it and she purrs like a kitten with no oil use between changes. Which is every spring.
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[SIGPIC][/SIGPIC]
Greg & Lynn (Full-Timing)
2011 Phaeton 42 QBH / Spartan Chassis
2003 Jeep GC Overland in Tow
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08-21-2011, 08:10 PM
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#9
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Winnebago Owner
Join Date: Apr 2010
Posts: 141
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My Onan dealer suggested I stay with the Onan 15/40 in my diesel. Said main problem is some oils tend to foam which is a no-no. Who knows, because I run mine almost continually because my wife needs an oxygen concentrator I followed his directions without problems. Do run Rotella in my Cummins.
Don
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08-21-2011, 08:57 PM
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#10
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Winnebago Owner
Join Date: Apr 2010
Posts: 83
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I use 15-40W Walmart brand whatever they call it in my 10kw Onan...so far it likes it...my Jeep does too!
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