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Old 02-24-2018, 02:40 PM   #1
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Generator Tune Up Options

Just took delivery on a used MH with a Onan Marquis Gold 5500 gen. Looking to tune it up, I see kits available but imagine that I can do it cheaper by using non cummings oil, etc. Concerned that the oil filter maybe specific to the gen. Is there another brand oil filter like Purolator, Fram, etc that this unit can use? What are the options?


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Old 02-24-2018, 03:39 PM   #2
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There are many cross-reference filter websites available, try entering the Cummins filter number into Google and see what turns up. Is it a gas, diesel, or LP generator? If gas, I'd certainly treat it with SeaFoam to help clean it out. New plugs and wires might also help it. Make sure the oil you use exceeds the requirements of the generator.

Going cheap to maintain an engine can sometimes return to bite you, make sure you take care of the engine so it will take care of you.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 02-24-2018, 03:55 PM   #3
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Oil filter cross reference
Ken & Jeannie - 96 Vectra Grand Tour 35' DP Freightliner 6 spd Allison Jack (silky terrier), Hannah (poodle), Casey (Cairn Terrier)
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Old 02-24-2018, 04:00 PM   #4
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When looking for Onan genset Parts you need some specific information to get the correct parts.
The model number and spec number. Mine happens to be on the air filter cover.
I have a 2001 Onan Marquis Gold 5500 Gas.
Model HGJAB-901A Spec: A

Onan Air Filter 0140-3116 Wix 49087
Onan Fuel Filter 0149-2629
Onan Oil Filter 0122-0836 Wix 57398
Onan Fuel Pump 149-2620 Airtex E11015
Onan Spark Plugs 0167-1638 NGK BPR4EY

Hope this helps. If not, then maybe it will help someone else.
Good luck
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Old 02-25-2018, 06:18 AM   #5
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What year is the coach ?
Be sure to service the spark arrestor. The oil filter has a bypass for cold starting make sure the non oem filter has this feature.
Pete , Stroudsburg , PA. 2017 Tiffin 32 SA 24K Chassis
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Old 02-25-2018, 07:10 AM   #6
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Welcome. Not sure if your 5500 is same as mine, but here is a brief article along with dfilter part numbers I use when I service mine..

Onan Marquis 5500 Generator Service – 1999 Southwind 35S


1999 Fleetwood Southwind 35S (Ford F53 6.8L V10 275hp 4R100 4 spd trans) - Toad 2003 Saturn Vue.

It won't do MACH 2, but I can get a sandwich and take a pee.
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