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Old 09-27-2020, 03:48 PM   #1
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Generator oil change

Couple of Questions

Onan is calling for OnaMax 15W40 oil for my specified operating range 0-100F.

1) Can I use any 15W40 oil in place of the OnaMax? (For different operating temps they do not specifically call for OnaMax)

2) How tight do I make the replacement filter?

I have a 5.5 HGJAB. I live in Arizona and many times it is between 80-100+


The below is from the Onan manual.

OIL VISCOSITY VS. TEMPERATURE SAE VISCOSITY GRADE
EXPECTED AMBIENT TEMPERATURES

32° F (0° C) and higher= 30
10° F to 100° F (-12° C to 38° C)= 15W40 OnaMax
0° F to 80° F (-18° C to 27° C)= 10W30/10W40
-20° F to 50° F (-28° C to 10° C)= 5W30

OnaMax is a trademark of Onan Corporation.



Thanks
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Old 09-27-2020, 05:18 PM   #2
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I have used Rotella 15-40 oil in our generators for the past 28 years and have never had a problem. We have had our current motorhome for 6-1/2 years and the generator has worked fine in all kinds of weather.
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Old 09-27-2020, 05:32 PM   #3
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Oil is oil.

If it meets the specs and you don't let it run out, your engine will run forever.

If your happy with a brand, use it.
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Old 09-27-2020, 05:47 PM   #4
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Diesel Oil

What are all the Rotella products called Diesel Oil?

Any advantage to "Blend" or "Full Syn" in a generator application?


Tnx
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Old 09-27-2020, 06:19 PM   #5
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I run straight 30W in mine and all my other air cooled power equipment. We only camp in the SoCal winters and would be lucky to see anything less than 50° at night.

Stick to a weight that works for the temperatures you are in. Brand of oil is meaningless.
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Old 09-27-2020, 06:43 PM   #6
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Use whatever 15W40 you plan to use in your coach, if that meets your spec requirements. That way you only need to carry one brand/container for both.
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Old 09-27-2020, 07:10 PM   #7
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Rotella T front and rear here.
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Old 09-27-2020, 10:13 PM   #8
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Quote:
Originally Posted by mchero View Post
Rotella T front and rear here.

Same here, Rotella 15-40 all around.
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Old 09-28-2020, 11:27 AM   #9
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Everybody keeps saying Rotella 15w30 diesel motor oil.

However, the OP has a gas generator and not a diesel generator. Does Rotella diesel oil meet all the specs for a gas generator?

I think the OP is asking specifically about the type of generator he has.
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Old 09-28-2020, 11:43 AM   #10
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Great info. for both gas and diesel generator owners.
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Old 09-29-2020, 09:05 AM   #11
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i also live in payson!

we have an onan 5500 lp generator in a fifth wheel. i use the onan 15-40. i buy it online and have it delivered. also buy an oil filter and air filter at the same time and change all of them once a year.

i'm sure the other brand oils would work fine as would another brand oil filter. but i just get them all at the same time and its done.
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Old 09-30-2020, 08:42 AM   #12
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Still have the question

I would still like to know why the the Rotella T-4 states "Heavy duty diesel engine oil" and is it safe to use in a gasoline powered Onan 5500? Don't care too much about the extra money but the T-4 is under $5.00 at Walmart and easy to get and the OnaMax is $15.00 and it needs to be ordered.
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Old 09-30-2020, 08:59 AM   #13
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For technical questions, contact our Technical Help Desk at (800) 237-8645 Option 3, 1; or Email: shelltechnical-us@shell.com with complete Year/Make/Model information for a recommendation.
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Old 09-30-2020, 09:05 AM   #14
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i have read several posts stating that onan 15w40 is around $15/qt. i buy it online from 'jacks small engine' for around 6$/qt. yes there as shipping but i also order the oil filter and air filter at the same time so the shipping is spread over more items.
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