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Old 06-14-2021, 08:31 PM   #1
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Onan Microquiet 4000 Oil Type

Hi, the only 15w40 oil I can find at my local autoparts is 15w40 oil which says on the bottle its for diesel engines. I've seen several brands that are all 15w40 and they are for diesel on the bottle. Is it okay to use this in the generator?
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Old 06-14-2021, 08:39 PM   #2
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Originally Posted by pinchio View Post
Hi, the only 15w40 oil I can find at my local autoparts is 15w40 oil which says on the bottle its for diesel engines. I've seen several brands that are all 15w40 and they are for diesel on the bottle. Is it okay to use this in the generator?
I use Rotella T6 synthetic on mine. Runs excellent.
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Old 06-14-2021, 08:45 PM   #3
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Look at the API spec required in your gensets manual and see if the oil you are looking at states that spec.
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Old 06-14-2021, 09:02 PM   #4
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I have the 4000 air cooled(powered by gas). I use 10w-30 in mine. Onan recommends 10w-30 for gasoline or lp powered generators.
Here's a link to their chart:
https://www.cummins.com/generators/m...-rv/onamax-oil
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Old 06-14-2021, 10:13 PM   #5
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I go by the chart in the manual, which goes by the temperature that you're probably going to be camping in, so I put 30 weight in mine because I usually camp in moderate temperatures. I suspect the change to a multi weight is so you get better mileage with your generator?
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Old 06-15-2021, 12:51 PM   #6
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I go by the chart in the manual, which goes by the temperature that you're probably going to be camping in, so I put 30 weight in mine because I usually camp in moderate temperatures. I suspect the change to a multi weight is so you get better mileage with your generator?
Ours is a 2003 so may have different specs than newer 4000 models.

My manual plainly states, and I quote, "Single grade SAE 30 oil is preferable when ambient temperatures are consistently above freezing". The chart below that statement in the manual shows the recommended viscosities below.

30W is good for 32 and higher,
15W-40 is good between 10 and 100F,
10W-30 and 10W-40 are good between 0 and 80F,
5W-30 is good between -20 and 50F.

I live in the south so 30W is the logical choice. Still, I have no doubt someone will come along and say I am wrong.
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