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Old 07-23-2010, 09:24 AM   #15
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Quote:
Originally Posted by Luv2go View Post
From one of the "other" forums:

I verified the Wix P/N using their website but did not verify NAPA, no reason to believe it is wrong.

Stewart

Thanks. Unfortunatly Wix is not that readilly available either and the one parts house here that carries it want $12 and does not stock it. Guess I will make the trek to PPL and get the filter twice a year. The Onan filter is only $8 there but its a drive.
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Old 07-24-2010, 07:03 AM   #16
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I use Amsoil 10W-40 and Napa Gold filters for the my 5.5 Onan generator. Here are some Onan #'s for a 5.5GMFA11578H you can cross reference.

Air filter: #0140-2379
Oil filter: #0122-0645
Fuel filter: #0149-2341

Sorry, but I don't have the Napa Gold filter number. You could probably cross reference on the Napa web site.
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Old 07-24-2010, 08:54 AM   #17
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The NAPA Gold #7398 oil filter is correct, I bought one yesterday.
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Old 07-24-2010, 01:31 PM   #18
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Quote:
The NAPA Gold #7398 oil filter is correct, I bought one yesterday.
Thanks for verifying that, Paul.

Jcthrone, we happened to be passing thorugh Miami one evening on vacation and passed right by the Cummins dealer, stopped there overnight and the next morning bought four filters, so I'm set for a couple of years.

Stewart
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Old 07-24-2010, 07:40 PM   #19
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I use NAPA 15W40 oil and filter
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Old 07-25-2010, 08:43 PM   #20
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If you are still looking for 15W-40 oil, Shell Rotella T as well as Chevron Delo are both readily available at any Wal-Mart or other autoparts stores....

When I changed the oil in my Onan gas generator, I used the Rotella...
Same here. If there is an issue with coolant....remember to change your anti-freeze and radiator cap on your onan every 2-3 years. Just did this along with a coolant system flush.
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Old 08-25-2016, 10:07 AM   #21
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Here's a list of filters that'll work for the Onan QG 5500 HGJAB generator. I know Walmart carries FRAM which is included in this list, so you can get oil and filter in one place.

ONAN 122-0836 - Alternative oil filters

ONAN 122-0836 - Alternative oil filters
Replacement oil filters for ONAN 122-0836:
Baldwin B7238
CARQUEST 84398
Champ PH2875
Fleetguard LF16165
Fram PH10027
HASTINGS B7238
HASTINGS LF644
LUBER-FINER PH2875
NAPA 7398
ONAN 122-0836
Wix 57398
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Old 08-26-2016, 06:12 AM   #22
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I run mobil 1 and a napa brand filter. The filters are a little over 6 bucks. I change it every 100 hours and at times it runs 100 hours straight. We are at 1600 hours already and never a problem even in 100 degree plus heat.
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Old 08-29-2016, 08:59 PM   #23
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Straight 30 weight conventional oil not recommended for temp under 40 degrees....
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Old 09-03-2016, 09:46 PM   #24
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I have a chemical engineer next door, he recommended I use 10W30 synthetic, so I did. He says it will run 90% cooler?
So he is saying that if your generator engine now operates at 190*F, after you install synthetic oil it will operate at 90% lower temperature????? I have to call bull-hocky on that.
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Old 09-04-2016, 04:53 AM   #25
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I have a chemical engineer next door, he recommended I use 10W30 synthetic, so I did. He says it will run 90% cooler?

Is he unemployed?
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Old 09-04-2016, 06:25 AM   #26
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So he is saying that if your generator engine now operates at 190*F, after you install synthetic oil it will operate at 90% lower temperature????? I have to call bull-hocky on that.

Maybe he meant that it would run at 90% of the previous temperature.

Example: 190 -(190 * .10) = 171
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Old 09-04-2016, 08:14 AM   #27
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He meant something, but not 90% cooler. I suspect he meant 10% cooler.
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Old 09-05-2016, 02:08 PM   #28
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To my thinking, if you have a 190*F thermostat in your engine, synthetic oil will not change that operating temperature. And then, there is this old thread that involved a lot or research: Synthetic lubricants-aren't.
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