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Old 11-09-2018, 12:37 PM   #1
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Changing the oil and filter in a 12.5 W Onan Generator

My rig has an Onan HDKCB 12.5 W generator and I will be doing an oil and filter change.

I'll be using Amsoil synthetic oil - 10W30 for 0 deg to 100 deg or 15W40 10 deg to 105 deg - but am unsure of the filter. I've heard that there is a larger - long life - filter (expensive) and the standard one 122-0893 (less expensive). Does anyone out there know what the part number is for this longer life filter and recommendation of where to purchase?

Thanks!!!
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Old 11-09-2018, 01:29 PM   #2
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The parts manual for my HDCAB only shows one filter for the oil. Never have seen a larger filter, but one may exist.
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Old 11-09-2018, 01:32 PM   #3
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Quote:
Originally Posted by Mhcorrigan View Post
The parts manual for my HDCAB only shows one filter for the oil. Never have seen a larger filter, but one may exist.
Based on the Cummins Operator's Manual, it's either a HDKCD or an HDKCB.
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Old 11-09-2018, 06:11 PM   #4
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For anyone else who may be interested:

Oil Filter 10hdkca & 12.5 - 0122-0893 - AMAZON = $39.95

Amsoil Signature Series Max-Duty Synthetic Diesel Engine Oil 15W-40 -
2 Gallons from AMSOIL $91.90
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Old 11-09-2018, 07:54 PM   #5
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onan oil filter

Wix 51334 about $6. A case of 12 is $52.80. That's $4.40 ea. This is for Onan 12.5K with Isuzu engine. I am sure similar filters and prices are available for Kuboto engine.
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Old 11-09-2018, 08:16 PM   #6
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Wix 51334 about $6. A case of 12 is $52.80. That's $4.40 ea. This is for Onan 12.5K with Isuzu engine. I am sure similar filters and prices are available for Kuboto engine.
"Isuzu engine" I'll check. But I'd though mine was a Cummins.
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Old 11-09-2018, 08:33 PM   #7
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I don't have a need for a 'longer life' filter. It get's changed with the oil.
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Old 11-10-2018, 08:08 AM   #8
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Cummins Onan RV Generator Handbook

Most of what you need to know is in here.

Cummins Onan RV Generator Handbook

While Onan is a Cummins product line, they typically incorporate Kubota or Isuzu diesel engines in generators used in our Class A coaches.

There are a couple of plates on your generator that identify the engine and give part numbers for oil, fuel, and air filters.

I searched the internet and found new-old-stock, genuine Onan filters at reasonable prices. Try Northwest RV Supply as a starting point.

Your generator will be happier with regular exercise than with synthetic oil and little exercise.

FWIW
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Old 11-10-2018, 12:12 PM   #9
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There is no Cummins engine small enough for an RV generator. They use Isuzu or Kubota. Mine is a 10K with a Kubota.

Cummins owns Onan, which causes some to expect a Cummins engine. The big Onan generators do use a Cummins.
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Old 11-12-2018, 02:51 PM   #10
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I use the Walmart filter equivalent ST-16 I think, and the absolute cheapest diesel oil. I put 200-290 hours on it and change it. Since I live 9 months a year on the road that is usually every 2 weeks. Cost for oil and filter is under $19.

6000 hours and happy as a pig in chit.
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