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08-11-2021, 08:18 PM
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#1
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Senior Member
Brand: Thor Motor Coach
Model: 2016 Freedom Elite 28H
State: Florida
Posts: 203
THOR #1929
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Synthetic oil in Onan
Hi all,
Has anybody used synthetic oil in their Onan generator. Mine is due for an oil change and I am thinking synthetic.
Thanks
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08-11-2021, 08:33 PM
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#2
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Senior Member
Brand: Still Looking
Model: S.O.B.
State: Florida
Posts: 684
THOR #14543
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Cummins does not recommend the use of Synthetic oil in Onan RV generators as there are no long-term benefits for the additional cost. The best oil you can use for your Onan 4000 generator would be a SAE 30W viscosity oil. Use a 10W40 oil viscosity when changing the oil in your 5500 generator.
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Ed
Some Other Brand w/2020 Jeep Gladiator Toad
Living The Dream in "God's Waiting Room"
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08-11-2021, 08:40 PM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,793
THOR #20289
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Let me paraphrase a respected mechanic I know who runs a big Cummins marine diesel shop in California: "I have never seen a properly maintained diesel engine harmed by regular, petroleum based lube oil."
Yes some synthetics have better lubricity properties than petroleum oils. And they last longer due to their chemistry resisting breakdown due to heat and time.
But they work well enough with petroleum based oil if you stick to Onan's oil change interval. If you want to extend it to 300 hours, then use synthetic oil.
David
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08-11-2021, 09:11 PM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,884
THOR #6826
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Quote:
Originally Posted by Popfla
Cummins does not recommend the use of Synthetic oil in Onan RV generators as there are no long-term benefits for the additional cost. The best oil you can use for your Onan 4000 generator would be a SAE 30W viscosity oil. Use a 10W40 oil viscosity when changing the oil in your 5500 generator.
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Onan recommends 15W40 conventional oil for their 4000KY and that’s what I use. I was in Texas during the unexpected deep freeze last February and had to start mine in the wee hours of a night during a sleet storm. I’m glad I didn’t have 30W in it!
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08-11-2021, 09:34 PM
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#5
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Senior Member
Brand: Still Looking
Model: S.O.B.
State: Florida
Posts: 684
THOR #14543
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Quote:
Originally Posted by Pete'sMH
Onan recommends 15W40 conventional oil for their 4000KY and that’s what I use. I was in Texas during the unexpected deep freeze last February and had to start mine in the wee hours of a night during a sleet storm. I’m glad I didn’t have 30W in it!
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What I posted was from Onan's user manual for the 4000 model.
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Ed
Some Other Brand w/2020 Jeep Gladiator Toad
Living The Dream in "God's Waiting Room"
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08-11-2021, 10:50 PM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: 2016 Freedom Elite 28H
State: Florida
Posts: 203
THOR #1929
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Thanks for all your input.
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08-11-2021, 11:12 PM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,884
THOR #6826
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Quote:
Originally Posted by Popfla
What I posted was from Onan's user manual for the 4000 model.
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No more so than mine was….
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08-11-2021, 11:54 PM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 25.6
State: New Mexico
Posts: 5,126
THOR #20220
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Quote:
Originally Posted by Popfla
Cummins does not recommend the use of Synthetic oil in Onan RV generators as there are no long-term benefits for the additional cost. The best oil you can use for your Onan 4000 generator would be a SAE 30W viscosity oil. Use a 10W40 oil viscosity when changing the oil in your 5500 generator.
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Same here
Onan 4000 generator would be a SAE 30W
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08-11-2021, 11:57 PM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 25.6
State: New Mexico
Posts: 5,126
THOR #20220
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Hey after how many hours do folks change the Onan 4000 gas oil?
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LAS CRUCES 2020 Thor Vegas 25.6
Lora & George. Golden Retriever & Multi-Gen Australian labradoodle & new ALD in March. Happy Campers!! E Biking, Hiking, Tennis, Scuba,Fishing,Cross Country Skiing, Snowshoeing. Retired H.S. Principal, Sr. IT Engineer, Life & Health Insurance Agent
"Today is a Gift and Why it is called the Present"
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08-12-2021, 12:19 AM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,160
THOR #12751
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Here's a good read......
https://newsroom.aaa.com/2017/06/aaa...-oil-changes/#
I use Synthetic or Synthetic Blends depending on the application. There are plenty of studies that show for a few extra bucks the benefits far outweigh the difference in price.
If you use conventional oil and follow the recommended maintenance schedule, you won't have any problems.
But when you are using an engine for "sever duty" applications, which I include as most motorhomes.... and even generators when temps are 90 degrees or higher.... the exra money for synthetic is worth it.
I can do a 12 quart oil & filter change for my SV34 for $80. The Ford sealer chargers $110 for conventional. Why wouldn't I use Synthetic for a 10-ton motorhome when I can do it for less? There's no downside.
I just changed the oil in my QD6000 last weekend and used Shell T5 15W-40 Synthetic Blend that met the Onan specs.
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08-18-2021, 09:29 PM
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#11
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Junior Member
Brand: Thor Motor Coach
Model: Tuscany 44MT
State: Texas
Posts: 16
THOR #22909
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I use synthetic 5w30 on both the 10kwQD and the L9 450 hp Cummins main motor. I change both myself on an annual basis.
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2017 Tuscany 44MT;1,200 watts solar;600AH Lifelines
2018 Colorado Z71 Centennial Edition Duramax Diesel
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08-18-2021, 10:54 PM
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#12
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Member
Brand: Thor Motor Coach
Model: Hurrican 34J
State: Texas
Posts: 63
THOR #4107
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I use synthetic oils on all my engines
I use synthetic oils on all my engines: Car, RV, Generator, Mower, etc.
it's more expensive, but I'm not worried if I used it past it's normal oil change, or if the temperature will be hot or cold.
Less breakdown from heat means less residual stuck inside the engine.
I used to rebuilt car engines back in my youth and saw the difference first hand.
Mobil 1 is my first choice, but I will use other brands if Mobil 1 is not available for whatever reason.
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08-18-2021, 10:55 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: Daybreak 22GOC
State: Kansas
Posts: 168
THOR #18675
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At the first oil change on my 4000, I used Mobil 1 10-40. In KS we can get temps over 100 and under 0 degrees.
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JimC
"Never promise more than you can give. Always give more than you promise."
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08-19-2021, 12:11 AM
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#14
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Senior Member
Brand: Thor Motor Coach
Model: Omni XG32 GONE for good
State: Alabama
Posts: 1,750
THOR #22586
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Since temps in south AL easily hit close to 100 in the summer and below 20 in the winter, 15W-40 for me.
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2022 Renegade Valencia 35MB
2021 Jeep Gladiator
2019 Harley Davidson FLHTC
2012 PT Crusader 355BHQ
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08-19-2021, 12:21 AM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 24.1
State: Florida
Posts: 892
THOR #5313
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I have 540 hours on Onan 4000 in Vegas. It get oil change annualy with 15w-40 conventional per manual. Is 6 years old. No issues or oil use so far.
All my other air cooled equipment use the same oil. The 3500 champion on race car trailer I bought week after RV probably has over 5000 hrs now. I have had to replace starter twice due to broken spring but it still does not use oil.
Key to generator life is oil changes and keep linkages lubed.
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08-19-2021, 03:36 AM
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#16
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Senior Member
Brand: Thor Motor Coach
Model: Daybreak 22GOC
State: Kansas
Posts: 168
THOR #18675
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Oil change interval on the 4000 is 20 hrs/150/300/450/etc @ 150 hours. according to the 4000 manual.
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JimC
"Never promise more than you can give. Always give more than you promise."
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08-19-2021, 04:58 AM
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#17
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Senior Member
Brand: Still Looking
Model: Sunstar 29VE Winnebago
State: Texas
Posts: 5,641
THOR #13058
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Can anybody cite a real life case or experience where whatever oil was used properly for routine maintenance every year or every 150 hours, there was a problem?
I use Chevron Delo 400 15w 40 https://www.walmart.com/ip/Chevron-D...E&gclsrc=aw.ds; it has a answer for every thing the oil czars wishes to throw out as important. I use it in the F-53 and Onan 5500.
With that said, if I wanted to be technically prudent, I would change oil twice a year regardless of hours. October with the Chevron Delo 400 and 6 months later in March with my favorite 30w oil of the day (This assumes you live in the South where it gets really hot; otherwise stick with the 15w 40
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2019 Sunstar 29ve; Toad Lincoln Navigator; RVi Brake 3 & Command Center; Roadmaster Nighthawk Tow bar & Baseplate; Sumo Springs; Safe T Plus; Onan EC-30 AGS; Vmax 250ah AGM; T-Mobile Internet; H/W Heater / Chassis Disconnect Switches; Southwire Surge Guard 44270 & 34951 w/Monitor 40301; Jet Flo Macerator; Alpine SPE500 Speakers; Visio M21D-H8R
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08-19-2021, 10:10 AM
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#18
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,327
THOR #6903
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I use synthetic Diesel oil and change at 200 hours or close
15-40 wt
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08-19-2021, 11:48 AM
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#19
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 24.1
State: Florida
Posts: 892
THOR #5313
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Have never seen an oil quality related faiure in anything including drag bikes, race motors etc. Choice of viscosity and change interval dependent on application. The RV onan get annual change as it never sees 150 hours in a year. The champion is every 90 days when we race a lot. The RV has been sitting so likely will change in Nov because we have been on any big trips. With all the rain, we have only raced twice this summer.
Time vs hours/miles is used when oil sits inactive. In Florida swamp if you leave something with open vented crankcase, rust starts. I pulled sons old racecar out and put engine in my car for 1 year. Then pulled apart and replaced rings/bearings/gaskets. They only real downside I found was rust stains on crank journals and cylinder walls. I had periodically run my oil primer to keep engine free. Newer stuff has better control of crankcase venting but I trust new oil more than old.
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08-19-2021, 12:17 PM
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#20
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Senior Member
Brand: Thor Motor Coach
Model: Omni XG32 GONE for good
State: Alabama
Posts: 1,750
THOR #22586
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Keep in mind we are talking about RV generators. So when deciding on oil weight, remember it doesn't sit in one location and one weather environment. By going with the weight for the greatest temperature range you possibly could experience, you are getting the best protection and performance.
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2022 Renegade Valencia 35MB
2021 Jeep Gladiator
2019 Harley Davidson FLHTC
2012 PT Crusader 355BHQ
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