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Old 04-08-2014, 02:24 PM   #1
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Onan Generator

I have a 7HGJAB900C generator and want to change oil and filter would like to use Mobil 1 and a Mobil 1 filter can anyone tell me what filter number fits it and what grade of oil to use Thanks Ken

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Old 04-08-2014, 08:04 PM   #2
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Check the generator manual for the oil viscosity and spec for the oil. Use the same or better spec and the proper viscosity oil. A supplier should be able to cross reference the manufacturers filter to another brand filter.


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Old 04-08-2014, 09:43 PM   #3
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We have a 5.5 HGJAB-1038E Onan generator. Just changed my oil this weekend. It uses a 0122-0836 filter. I would suspect that yours uses the same filter, but could be wrong.

From what I found on the internet it shows the same part number that I have listed above:

Onan Genuine Factory Parts Tune Up Kit For RV Models Marquis HGJAB HGJAA HGJAC

Oil Filter Part Number 0122-836. I think I would call Onan, or maybe even Camping World to verify the part number.

For the oil my manual shows API CH-4, CG-4, or CF-4 (SJ/CH-4) 15W-40, or 10W-30 10W-40, depending on the expected ambient temperatures.
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Old 04-08-2014, 10:26 PM   #4
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When putting the oil back in do it very slow or you will have oil all over the place.
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Old 04-09-2014, 09:26 AM   #5
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Assuming from your post, you want to save $$ from buying the Onan parts, that's what we do. Take your filter P/N to Napa Auto, they have filters for most Onan Generators, cheaper than Onan. As a side note, buy your filter on their monthly 1/2 price filter Fridays--even greater savings. As for oil, check your manual for recommended specs for the temperature range you will be in.

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