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07-01-2018, 06:34 PM
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#1
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Senior Member
Join Date: Jun 2015
Location: Southern California
Posts: 2,087
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Rotella 15w40 for Onan 4K
Has anyone used Shell Rotella 15w40 oil for their Onan 4K? I couldn't find any other brand and I noticed this is for diesel. My buddy said he thinks it has the same specs and the Cummins Onan he has been using. Is he correct?
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2004 Winnebago Minnie 22e(went to a nice family Oct 3, 2015)
2016 Forester 2701DS (Aug 31, 2015)
2017 Camping 12 trips 38 nights
2018 Camping 10 trips 38 nights
2019 Camping 6 trips 19 nights
2020 Camping 0 trips Cancellations 6
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07-01-2018, 07:36 PM
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#2
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Senior Member
Join Date: Jun 2015
Location: Southern California
Posts: 2,087
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My buddy sent me a photo of the Onan oil and the specs are the same as Rotella T4.
__________________
2004 Winnebago Minnie 22e(went to a nice family Oct 3, 2015)
2016 Forester 2701DS (Aug 31, 2015)
2017 Camping 12 trips 38 nights
2018 Camping 10 trips 38 nights
2019 Camping 6 trips 19 nights
2020 Camping 0 trips Cancellations 6
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07-01-2018, 09:54 PM
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#3
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Senior Member
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,230
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That's what I use since there is no oil filter on mine.
Quote:
Originally Posted by Sagecoachdriver
Has anyone used Shell Rotella 15w40 oil for their Onan 4K? I couldn't find any other brand and I noticed this is for diesel. My buddy said he thinks it has the same specs and the Cummins Onan he has been using. Is he correct?
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Sent from my VS501 using Tapatalk
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2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
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07-02-2018, 02:26 PM
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#4
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Certified Curmudgeon
Join Date: Mar 2013
Location: Here
Posts: 3,999
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Shell is good oil to use. You want a “diesel” rated sauce because of its ability to suspend particulate.
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Mike Dropped
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07-02-2018, 02:46 PM
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#5
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,891
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When I called, Onan specifically recommended Valvoline / Premium Blue engine oil SAE 15W-40. AutoZone had it, so that's what I used.
Not sure if it helps as it wasn't quite the question you asked. 
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Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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07-03-2018, 01:42 PM
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#6
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Senior Member
Join Date: Jan 2018
Posts: 402
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Quote:
Originally Posted by ependydad
When I called, Onan specifically recommended Valvoline / Premium Blue engine oil SAE 15W-40. AutoZone had it, so that's what I used.
Not sure if it helps as it wasn't quite the question you asked. |
Of course Onan recommended VPB. Onan is owned by Cummins who also is associated with Valvoline. They want you to buy their stuff.
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07-03-2018, 02:18 PM
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#7
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Senior Member
Join Date: Jul 2017
Location: SO-CAL
Posts: 503
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I think I used the Shell oil in mine a few months ago. I also added a few ounces of "Marvels Mystery oil". This stuff is great in both oil and gas. You can get it at Walmart.
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RETIRED U.S. NAVY
2017 FORESTER 3051S
IN SO-CAL
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07-03-2018, 02:36 PM
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#8
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Senior Member
Join Date: May 2016
Location: Yellowknife
Posts: 1,162
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Quote:
Originally Posted by Mad Cow
Of course Onan recommended VPB. Onan is owned by Cummins who also is associated with Valvoline. They want you to buy their stuff.
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OP isn't going to go wrong with either. Can't get Valvoline here yet that I know of so I buy Rotella by the pail when they go on sale. That and with the rebates they offer oil changes are stay extremely cheap.
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2007 Rockwood 2701SS
2017 Ram 2500 Granite Crystal SAP Laramie 6.7L
2014 Triumph Bonneville. NH Togas, tuned
1953 GMC 9314
1982 GoldWing Interstate
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07-03-2018, 04:51 PM
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#9
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Senior Member
Join Date: Feb 2018
Location: Marco Island, Fl
Posts: 251
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I’ve been using Rotella T in all my diesel trucks, GM, Ford, boats, mostly Cummins, and generators, Onan and Northern Lights, for 30 years. Among professionals it’s considersd the best motor oil available for heavy duty applications. I will definitely use it in my new motor home at the 50 hour change no matter what brand was in the factory original fill.
Just my experienced opinion.��
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2019 Dx3 TS
2020 RAM 1500 Limited Diesel 4x4
7 lb Guard Dog
Working hard on “elderhood”
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07-03-2018, 05:17 PM
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#10
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Senior Member
Join Date: Jun 2015
Location: Southern California
Posts: 2,087
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Thanks for all the replies. Using SAE 15W40 Rotella or other brands is cheap enough and the key is to change it every 50 hours or once a year. Having solar panels on the roof cuts back my generator usage so I will have to exercise it once a month and change the oil once a year. I don't think I will be using 50 hours a year now.
__________________
2004 Winnebago Minnie 22e(went to a nice family Oct 3, 2015)
2016 Forester 2701DS (Aug 31, 2015)
2017 Camping 12 trips 38 nights
2018 Camping 10 trips 38 nights
2019 Camping 6 trips 19 nights
2020 Camping 0 trips Cancellations 6
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07-03-2018, 05:20 PM
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#11
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Senior Member
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,230
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I excersize mine once a month and change the oil every other chassis engine oil change.
Sent from my VS501 using Tapatalk
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2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
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07-03-2018, 08:11 PM
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#12
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Senior Member
Join Date: Oct 2016
Location: Alaska
Posts: 1,830
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Quote:
Originally Posted by A32Deuce
I excersize mine once a month and change the oil every other chassis engine oil change.
Sent from my VS501 using Tapatalk
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The Onan manual says change oil every 150 hours or once a year after breakin. Where did the oil change every 50 hours come from? Am I missing something?
See 'General Generator Maintenance Intervals' page 22:
Cummins Onan RV Generator Handbook
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07-03-2018, 08:59 PM
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#13
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Senior Member
Join Date: Oct 2013
Location: Florida
Posts: 1,363
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I use shell Rotella 15 40 for onan Gen. I change it once a year as I only use generator about 100 hrs a year. Great oil.
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2016 Forester GTS 2801QSF 
2011 Jeep JK Toad
Habitual RV Modifier
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07-04-2018, 08:40 AM
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#14
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Senior Member
Join Date: Jun 2015
Location: Southern California
Posts: 2,087
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Quote:
Originally Posted by rk06382
The Onan manual says change oil every 150 hours or once a year after breakin. Where did the oil change every 50 hours come from? Am I missing something?
See 'General Generator Maintenance Intervals' page 22:
Cummins Onan RV Generator Handbook |
You're correct, I miss read it. 150hrs or 1 year and I only have 160 hours on mine after 3 years. So every July 1st for me.
__________________
2004 Winnebago Minnie 22e(went to a nice family Oct 3, 2015)
2016 Forester 2701DS (Aug 31, 2015)
2017 Camping 12 trips 38 nights
2018 Camping 10 trips 38 nights
2019 Camping 6 trips 19 nights
2020 Camping 0 trips Cancellations 6
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07-04-2018, 09:34 AM
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#15
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Senior Member
Join Date: Jul 2014
Location: SouthWest Michigan
Posts: 5,977
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Who much oil does the 4K hold ???
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07-04-2018, 09:35 AM
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#16
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Senior Member
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,230
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Not quite 2 quarts.
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2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
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07-04-2018, 09:37 AM
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#17
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Senior Member
Join Date: Jul 2014
Location: SouthWest Michigan
Posts: 5,977
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Quote:
Originally Posted by A32Deuce
Not quite 2 quarts.
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THANKS Deuce !!!
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07-04-2018, 09:44 AM
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#18
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Senior Member
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,230
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I buy a 4 quart container and fill a quart container at a time.
__________________
2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
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07-04-2018, 09:47 AM
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#19
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Senior Member
Join Date: Jul 2014
Location: SouthWest Michigan
Posts: 5,977
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Quote:
Originally Posted by A32Deuce
I buy a 4 quart container and fill a quart container at a time.
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Did not know that you could buy oil in a 4 Qt container ???
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07-04-2018, 10:18 AM
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#20
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Senior Member
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,230
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Where I get my supply they have 4 qts. Interesting is oil for gas engines is in 5 qt. containers. Diesel type comes in 4 qt. Containers.
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2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
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