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Old 07-21-2010, 12:12 PM   #1
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Onan Oil?

I have changed the oil in my gas pwoered Onan GenSet myself and have used the Onan filters and oil. I would like to start using another leading brand of oil at the next oil change. However, I can not find 15w-40 oil. I can easily find 10w-40 and believe this will be fine.

The Onan Owner's manual lists something strange. The 15w-40 lists air temp between 10deg and 100deg. It also list 10w-30 and 10w-40 in the same line and says it protects in the air temp range of 0deg to 80deg. This doesn't sound right to me. Why would 10w-40 only protects to a max temp of 80deg when the 15w-40 protect to 100deg?

Has anyone else changed oil weights and brands in their Onan Genset?

Thanks,
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Old 07-21-2010, 12:15 PM   #2
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Onan Oil

I have a chemical engineer next door, he recommended I use 10W30 synthetic, so I did. He says it will run 90% cooler?
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Old 07-21-2010, 12:36 PM   #3
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If you are still looking for 15W-40 oil, Shell Rotella T as well as Chevron Delo are both readily available at any Wal-Mart or other autoparts stores....

When I changed the oil in my Onan gas generator, I used the Rotella...
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Old 07-21-2010, 12:39 PM   #4
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We used 10w-30 amzoil synthetic in our propane genset. Would start at 30 below and was good for 100 above also.
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Old 07-21-2010, 01:02 PM   #5
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I also use Rotella 5W40 it is available almost anywhere. The filter I use is a Wix sold by NAPA.
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Old 07-21-2010, 01:08 PM   #6
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I've been using 10W-30 Mobil 1 synthetic and a NAPA filter for 4 years with no problems.
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Old 07-21-2010, 01:26 PM   #7
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I did change to full sythetic in the coach about a year ago. I guess I could change to sythetic in the genset as well.

The biggest thing that threw me was Onan combining 10w-30 and 10w-40 in the same temp range in the owners manual and it having a lower max temp than 15w-40.

The Wix filter from NAPA? I have heard others using this filter with good success. I assume NAPA can cross reference the correct Wix filter to the OEM Onan filter? Would I give them the Onan filter number or do I need to give them the model number?

I ran Shell Rotella T in my diesel pickup for years. I did not know this oil would work in a gasoline engine?
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Old 07-21-2010, 01:36 PM   #8
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Quote:
This doesn't sound right to me. Why would 10w-40 only protects to a max temp of 80deg when the 15w-40 protect to 100deg?
Maybe because they like to sell their OnaMax 15W40 oil? Of course, I assume they have done some testing to verify these recommendations.

Quote:
I ran Shell Rotella T in my diesel pickup for years. I did not know this oil would work in a gasoline engine?
Since 15W40 is a common oil used for diesel engines it may explain why Cummins likes it even for their gas engines.

Also, my understanding is that the OnaMax 15W40 oil is really Valvoline 15W40 oil, which I picked up at AutoZone.

Interestingly, the only oil my manual recommends for temps above 100 is single weight SAE30, same as I normally use in my lawn mower.

Quote:
The Wix filter from NAPA? I have heard others using this filter with good success. I assume NAPA can cross reference the correct Wix filter to the OEM Onan filter? Would I give them the Onan filter number or do I need to give them the model number?
I found the filters at Cummins Power South for about $8.45 ea. RV dealers are all over the map on price, as much as $13.00 for the same filter. NAPA/Wix does have a cross reference, at least for my filter. My understanding is Onan filters are actually made by Wix.

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Old 07-21-2010, 01:53 PM   #9
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When I had my Suncruiser gaser I used Mobil 1 10w-30 with the Mobil 1 oil filter. Never a problem.
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Old 07-21-2010, 02:55 PM   #10
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I am with Tincup on this issue, I use Mobile 1 synthetic 10W30 and a NAPA oil filter in the Gen-set.
Mobile 1 synthetic 10W30 in the Coach engine with an K&N synthetic oil filter.
Synthetic oil in the transmission and differential as well.

Henry.
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Old 07-21-2010, 08:11 PM   #11
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Any store that carries diesel oil will have 15W40, which is the standard oil for diesel engines. 10W40 is ok, though.

Even Walmart has 15W40!
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Old 07-21-2010, 09:40 PM   #12
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Thanks All! As usual, my friends here provided the answers. I will most likely switch to synthetic on the next oil change in the genset.

I have seen the diesel oil (Rotella, Delo, etc) in 15w-40 just never considered putting it in a gas engine.
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Old 07-22-2010, 09:42 AM   #13
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I also run the Rotella in the gen set. Already have it at the house for the pickup, and several other engines.

Since several others here run name brand equivelent filters on thier onan, perhaps some can post the filter numbers that work for a Marquis Gold 5500? The filters for my previus Onan Emerald were easy to come by a Wal-mart (Motorcraft FL400s) but have not found a good cross reference for the Marquis.
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Old 07-23-2010, 08:04 AM   #14
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Quote:
Since several others here run name brand equivelent filters on thier onan, perhaps some can post the filter numbers that work for a Marquis Gold 5500? The filters for my previus Onan Emerald were easy to come by a Wal-mart (Motorcraft FL400s) but have not found a good cross reference for the Marquis.
From one of the "other" forums:

Quote:
Onan 5.5 Gold Oil Filter:

Onan # 122-0836

Napa #7398

Wix #57398
I verified the Wix P/N using their website but did not verify NAPA, no reason to believe it is wrong.

Stewart
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