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01-10-2018, 01:35 PM
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#1
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Member
Tiffin Owners Club
Join Date: Nov 2016
Posts: 87
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Onan QD maintenance - Rotella or Onan oil
I decided to do the maintenance this year on my QD 7.5K. I bought the Onan brand oil, air and fuel filters. I found the Onan 15W40 oil online for $15/qt. That seems kinda expensive!
Question: Is Onan oil really that superior or will something else do, like Shell Rotella oil that's sitting in my garage?
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01-10-2018, 01:50 PM
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#2
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Senior Member
Join Date: Aug 2015
Location: Graham, WA
Posts: 169
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Depending on your generator usage and outside temperature will dictate the allowable/best oil to use. You can never go wrong using the Onan 15W-40. A very good and less expensive alternative is Chevron Delo 400 15W40. It is specifically designed for diesel applications and runs less than $20.00 a gallon at AutoZone. I realize you only use 3 quarts but it is nice to have a little extra as well. I hope this helps.
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Mike & Mary Favors (RUNAWAY)
2015 Newmar Ventana 4002 & 2015 Jeep GC Limited
Emma, Margarita & Cami (Furry kids)
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01-10-2018, 04:00 PM
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#3
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Senior Member
Join Date: Aug 2008
Location: Georgia
Posts: 6,466
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Me and probably everyone else uses the same oil in the engine and genny. I use rotella 15w40
__________________
2007 Fleetwood Revolution LE 40V
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01-10-2018, 04:13 PM
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#4
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 6,955
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Quote:
Originally Posted by Tha_Rooster
Me and probably everyone else uses the same oil in the engine and genny. I use rotella 15w40
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+1.
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Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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01-10-2018, 04:16 PM
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#5
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 14,980
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Quote:
Originally Posted by Tha_Rooster
Me and probably everyone else uses the same oil in the engine and genny. I use rotella 15w40
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Agree.
__________________
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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01-10-2018, 04:20 PM
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#6
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Senior Member
Join Date: Nov 2005
Posts: 6,321
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Wow--Onan 15w-40 is $5-6 at my local Cummins.....otherwise, use in the Onan what you use in the diesel RV engine...makes carrying extra oil much simpler....same applies for the Onan coolant---its not a wet-sleeve engine so whatever you use in the RV engine is fine there too...Don't even want to ask where/what you paid for the filters?? Curious, how often do you change oil/ filters in yr Onan?
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Old Scout
2003 Alpine 40' MDTS
New Braunfels, Texas
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01-10-2018, 04:35 PM
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#7
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Member
Tiffin Owners Club
Join Date: Nov 2016
Posts: 87
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Thanks for all the input!
Turns out what I thought was Rotella in my garage was actually Delo, that I use for my truck...
No local Cummins, so online abt $70 for oil/air/fuel combo. I'll have to compare when I get to a Cummins shop...
2nd year of ownership of a 08 coach - initial svc done by Cummins. Put abt 400 hrs on the genset last season.
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01-10-2018, 05:22 PM
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#8
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Senior Member
Join Date: Aug 2008
Location: Georgia
Posts: 6,466
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Quote:
Originally Posted by DFitz
Thanks for all the input!
Turns out what I thought was Rotella in my garage was actually Delo, that I use for my truck...
No local Cummins, so online abt $70 for oil/air/fuel combo. I'll have to compare when I get to a Cummins shop...
2nd year of ownership of a 08 coach - initial svc done by Cummins. Put abt 400 hrs on the genset last season.
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I purchase all my filters at rvchassisparts.com
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2007 Fleetwood Revolution LE 40V
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01-11-2018, 10:43 AM
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#9
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 44,479
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Quote:
Originally Posted by Tha_Rooster
Me and probably everyone else uses the same oil in the engine and genny. I use rotella 15w40
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Yup!  
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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01-17-2018, 11:57 AM
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#10
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Senior Member
Join Date: Oct 2012
Posts: 975
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FWIW I just left the Freightliner factory service center in Gaffney SC.
I had my engine and genny oil changed.
The ONLY oil they carry is Rotella 15W40 for both applications.
__________________
2016 Newmar Ventana 4369 with 2019 Ford Ranger toad
Full timing since 2016
My life goal is to be as smart as the others on this forum.
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01-17-2018, 12:04 PM
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#11
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Senior Member
Country Coach Owners Club Winnebago Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,153
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My Onan 12.5 has a Kubota engine. I use the same oil in it as the ISX. The coolant is different as I haven't changed to an OAT coolant in it like I have in the ISX.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 Jeep JKU Dragon Edition
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01-17-2018, 12:21 PM
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#12
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Senior Member
Foretravel Owners Club
Join Date: Apr 2016
Location: Home is Where WE PARK IT...
Posts: 4,724
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Quote:
Originally Posted by Mr_D
My Onan 12.5 has a Kubota engine. I use the same oil in it as the ISX. The coolant is different as I haven't changed to an OAT coolant in it like I have in the ISX.
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Yup, 15/40 Delo or Mobile equivalent for engine & Kabota gennie.
Went with the NAPA Yellow/Orange OAT for all coolants, including the boiler on our AquaHot.
(NOTE!!!!! Our AquaHot is an older model (exe-100-02s) that uses regular antifreeze vs "boiler fluid" used in the newer models)
__________________
Retired truckdriver, Full Timing in a Foretravel.
Escapees of Box Elder, South Dakota
....Whether our shack is moving or is parked.. We are still home.
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01-17-2018, 05:09 PM
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#13
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Senior Member
Join Date: Aug 2013
Location: Cincinnati, OH
Posts: 827
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Just a FYI, if you want to run synthetic, 5W-40 is the synthetic diesel oil. 15W-40 are conventional oil. I agree with all the previous replies, any diesel rated oil is fine for your generator.
I run synthetic 5W-40 in my generator, but with 11 gallons required in my ISX engine, I use the conventional there.
__________________
2017 Renegade Verona 36 VSB
2005 Kenworth Showhauler truck conversion. sold .
I used to have a handle on life, but it broke 
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01-20-2018, 11:03 PM
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#14
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Senior Member
Winnebago Owners Club
Join Date: May 2008
Location: Surprise, AZ
Posts: 785
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Quote:
Originally Posted by 38Chevy454
Just a FYI, if you want to run synthetic, 5W-40 is the synthetic diesel oil. 15W-40 are conventional oil. I agree with all the previous replies, any diesel rated oil is fine for your generator.
I run synthetic 5W-40 in my generator, but with 11 gallons required in my ISX engine, I use the conventional there.
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Ditto... My mechanic recommended the synthetic 5W-40 for my generator. Runs a little quieter too... (IMHO)...
__________________
John Rossi
2013 Itasca Sunstar 26HE
Firestone Airbags, Hellwig front/rear Anti-Sway Bars,
Rear Trac Bar, Safe-T-Plus, and 480 watt solar system.
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