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10-28-2018, 01:08 PM
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#1
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Senior Member
Join Date: Apr 2016
Location: Portland, Oregon
Posts: 185
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Onan generator -- Oil Filter ??
Time for the first oil change (20hrs). Looking at the manual I can't find any indication that there is an oil filter for the Onan 4.0kw generator. Manual says to change the oil but no mention of a filter.... ??? Hmmm
Am I missing something??
Help and suggestions appreciated.
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Due to depreciation the above opinion is now worth less than what you paid for it.
Everyone is good at something... I happen to be a good bad example.
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10-28-2018, 01:10 PM
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#2
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Senior Member
Join Date: Oct 2013
Location: Florida
Posts: 1,363
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The Onan 4k does not have an oil filter. Very simple process. Drain oil using drain plug on bottom of unit. Replace drain plug and refill with 1.6 quarts of oil. Done.
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2016 Forester GTS 2801QSF 
2011 Jeep JK Toad
Habitual RV Modifier
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10-28-2018, 01:18 PM
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#3
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Senior Member
Join Date: Apr 2016
Location: Portland, Oregon
Posts: 185
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WOW, now that's fast reply. THANK YOU.
I do figure you had minor typo as manual says 1.6 qt of oil (not 2.6) but again thanks.
__________________
Due to depreciation the above opinion is now worth less than what you paid for it.
Everyone is good at something... I happen to be a good bad example.
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10-28-2018, 01:19 PM
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#4
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Senior Member
Join Date: Oct 2013
Location: Florida
Posts: 1,363
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Lol you are correct 1.6 quarts. My fingers are faster than my brain.
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2016 Forester GTS 2801QSF
2011 Jeep JK Toad
Habitual RV Modifier
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10-28-2018, 01:37 PM
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#5
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Senior Member
Join Date: Oct 2014
Location: Central Florida
Posts: 599
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re
Use 30w, not synthetic
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10-28-2018, 02:03 PM
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#6
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Senior Member
Join Date: Apr 2016
Location: Portland, Oregon
Posts: 185
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due to temp spread here in Oregon was going to use 15w-40 (per manual).
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Due to depreciation the above opinion is now worth less than what you paid for it.
Everyone is good at something... I happen to be a good bad example.
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10-28-2018, 03:11 PM
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#7
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Senior Member
Join Date: Nov 2015
Posts: 4,223
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Quote:
Originally Posted by poppytoymaker
Use 30w, not synthetic
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Why is that? Not prohibited per the manual.
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BIRDS AREN’T REAL
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10-29-2018, 02:38 PM
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#8
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Senior Member
Join Date: Jul 2017
Location: SO-CAL
Posts: 503
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Quote:
Originally Posted by Oregon
Time for the first oil change (20hrs). Looking at the manual I can't find any indication that there is an oil filter for the Onan 4.0kw generator. Manual says to change the oil but no mention of a filter.... ??? Hmmm
Am I missing something??
Help and suggestions appreciated.
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20Hrs, not sure about that one. I changed mine at 150 and the oil looked fine. 15/40w is what I used and haven't had any issues.
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RETIRED U.S. NAVY
2017 FORESTER 3051S
IN SO-CAL
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10-29-2018, 02:50 PM
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#9
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Senior Member
Join Date: Nov 2015
Posts: 4,223
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Quote:
Originally Posted by Philkaty
20Hrs, not sure about that one. I changed mine at 150 and the oil looked fine. 15/40w is what I used and haven't had any issues.
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Oman manual page 29 calls for initial oil change at 20 hours the every 150 hours after that.
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BIRDS AREN’T REAL
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10-29-2018, 03:01 PM
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#10
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Senior Member
Join Date: Jul 2017
Location: SO-CAL
Posts: 503
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Quote:
Originally Posted by emm-dee
Oman manual page 29 calls for initial oil change at 20 hours the every 150 hours after that.
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I hope that the dealer did it, but most likely not. It runs great and I run Marvels Mystery Oil in the gas and put about 3 Oz's in the oil at the change.
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RETIRED U.S. NAVY
2017 FORESTER 3051S
IN SO-CAL
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10-29-2018, 03:30 PM
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#11
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2014 XLR 27HFS
Join Date: Apr 2014
Location: Clearwater, FL
Posts: 493
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I run 30w, but I'm in Florida. In cooler climates, 10w40 might be better. Don't forget to add Sta-Bil to your gas and run the gennie every couple of weeks.
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Dave & Audrey
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10-29-2018, 06:12 PM
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#12
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Senior Member
Join Date: Mar 2013
Posts: 1,485
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If you have not changed the oil yet, pour slowly.
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2014 Sunseeker 3170 DSF
Dorothy, Garrette and Miss Bella.
Retired and having fun.
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10-30-2018, 07:16 AM
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#13
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Newly Retired
Join Date: Jan 2016
Location: North GA
Posts: 220
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Since there is no oil filter, the only way to get dirt out is by draining the oil. Changing oil is a very inexpensive way to prolong the life of a hard working engine.
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10-30-2018, 08:04 AM
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#14
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Senior Member
Join Date: Jul 2017
Location: SO-CAL
Posts: 503
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I think the worst thing is that it has a carb. and when you stop running it for awhile the gas starts to go bad no matter if you use sta-bil or not. Since we have a 55 gallon gas tank pouring sta-bil in it isn't going to do much. I don't usually leave a full tank in the RV but over a 1/4 so I can run the generator time to time while in storage.
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RETIRED U.S. NAVY
2017 FORESTER 3051S
IN SO-CAL
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10-30-2018, 09:51 AM
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#15
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Senior Member
Join Date: Jul 2015
Location: Charlotte, NC
Posts: 924
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Quote:
Originally Posted by Philkaty
I think the worst thing is that it has a carb. and when you stop running it for awhile the gas starts to go bad no matter if you use sta-bil or not. Since we have a 55 gallon gas tank pouring sta-bil in it isn't going to do much. I don't usually leave a full tank in the RV but over a 1/4 so I can run the generator time to time while in storage.
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Note - the generator will not be able to pull fuel from the gas tank right at about 1/4 tank. (depending on the level of RV) This is by design so that the genset can never deplete the gas tank fully and leave you stranded. I go with no more than 1/2 tank for winter storage since my storage space is slanted towards the rear.
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10-30-2018, 10:47 AM
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#16
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Senior Member
Join Date: Jul 2014
Location: SouthWest Michigan
Posts: 5,977
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Quote:
Originally Posted by newRVer
Note - the generator will not be able to pull fuel from the gas tank right at about 1/4 tank. (depending on the level of RV) This is by design so that the genset can never deplete the gas tank fully and leave you stranded. I go with no more than 1/2 tank for winter storage since my storage space is slanted towards the rear.
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Right on !!
1/2 or more,,, Stabil & Seafoam !!!
Oil 15/40 High Quality Oil !!!
Like Shell Rotella !!!
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10-30-2018, 02:29 PM
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#17
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Senior Member
Join Date: Jul 2017
Location: SO-CAL
Posts: 503
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Quote:
Originally Posted by newRVer
Note - the generator will not be able to pull fuel from the gas tank right at about 1/4 tank. (depending on the level of RV) This is by design so that the genset can never deplete the gas tank fully and leave you stranded. I go with no more than 1/2 tank for winter storage since my storage space is slanted towards the rear.
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Funny thing is how I found out. Our old RV, I was at Home Depot and left the Gen on and when I came out it was off. So I called the dealer and they asked me how much gas was in it (less than 1/4) and when I filled it up it work fine. It was a used RV and our first, the guy that went over it might have told us it, but so much stuff you don't remember it all. Glad it was near home and not out bonedocking.
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RETIRED U.S. NAVY
2017 FORESTER 3051S
IN SO-CAL
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