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Recommended oil for a Cummins Onan 4000k generator #4680187
02/28/18 12:54 AM
02/28/18 12:54 AM
Joined: Jun 2014
Posts: 19
Roseville, CA
trod30 Offline OP
trod30  Offline OP
Joined: Jun 2014
Posts: 19
Roseville, CA
Amsoil small engine 10w40 or Shell Rotella T6 or whatever else you recommend. It sounds like some guys use diesel oil. I think it takes a quart or less so price is not an issue.

Re: Recommended oil for a Cummins Onan 4000k generator [Re: trod30] #4680200
02/28/18 01:50 AM
02/28/18 01:50 AM
Joined: May 2012
Posts: 5,660
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,660
Fort Lauderdale, FL
Factory rec is 15w-40 diesel oil, but Amsoil small engine would be phenomenal for that engine due to its super low noack and it just being a great oil in the first place.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Recommended oil for a Cummins Onan 4000k generator [Re: trod30] #4680203
02/28/18 02:20 AM
02/28/18 02:20 AM
Joined: Dec 2002
Posts: 42,293
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,293
New Jersey
What kind of engine? What does the manual say?

Re: Recommended oil for a Cummins Onan 4000k generator [Re: trod30] #4680221
02/28/18 04:11 AM
02/28/18 04:11 AM
Joined: Jan 2009
Posts: 2,469
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,469
wi
Amsoil be my first pick as always in the small stuff that formulation is strong.

Re: Recommended oil for a Cummins Onan 4000k generator [Re: trod30] #4680352
02/28/18 07:45 AM
02/28/18 07:45 AM
Joined: Jul 2017
Posts: 542
Texas (south)
FermeLaPorte Offline
FermeLaPorte  Offline
Joined: Jul 2017
Posts: 542
Texas (south)
Chevron DELO would be a better fit since diesel oil is HDEO, AMsoil is boutique meaning just for show


Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.
Re: Recommended oil for a Cummins Onan 4000k generator [Re: trod30] #4680446
02/28/18 09:38 AM
02/28/18 09:38 AM
Joined: Jun 2013
Posts: 1,762
Virginia
mattwithcats Offline
mattwithcats  Offline
Joined: Jun 2013
Posts: 1,762
Virginia
Shell Rotella T6, in 5W-40

If it has a filter, and you can squeeze it on, the Fram 3600 / Purolator 20195 / Wix 51516 is 5 inches long,
verses 3 and a half for the 3614...


2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Purolator Synthetic PSL 14610, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)
Re: Recommended oil for a Cummins Onan 4000k generator [Re: mattwithcats] #4680515
02/28/18 11:19 AM
02/28/18 11:19 AM
Joined: Mar 2011
Posts: 286
NM, USA
pkunk Offline
pkunk  Offline
Joined: Mar 2011
Posts: 286
NM, USA
Originally Posted By: mattwithcats
Shell Rotella T6, in 5W-40

If it has a filter, and you can squeeze it on, the Fram 3600 / Purolator 20195 / Wix 51516 is 5 inches long,
verses 3 and a half for the 3614...


This. Those little filters are h**l to get off. Most any 0-40 or 5-40 diesel oil is fine. The Onan runs hot especially those in a RV compartment.


2008 Mini Cooper Clubman (toad)
2000 Mercedes ML320
1994 Dodge 2500 Cummins
1999 Ford F53 V10 Coachman Motorhome 34ft
Re: Recommended oil for a Cummins Onan 4000k generator [Re: trod30] #4680555
02/28/18 12:06 PM
02/28/18 12:06 PM
Joined: Jun 2014
Posts: 1,942
Ca.
UncleDave Offline
UncleDave  Offline
Joined: Jun 2014
Posts: 1,942
Ca.
I ran M1 0w40 in my onan 4K "microquiet" as its pretty cheap and I always have a lot on hand.

Rotella will be fine if not great

No filter on that genset - splash only lubrication.

It does have a nice altitude adjustment on the carb.

It drinks like a sailor consuming about 1/3 GPH at a constant 3600 RPM even idling.





UD

Last edited by UncleDave; 02/28/18 12:09 PM.

Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: Recommended oil for a Cummins Onan 4000k generator [Re: UncleDave] #4680568
02/28/18 12:25 PM
02/28/18 12:25 PM
Joined: Mar 2011
Posts: 286
NM, USA
pkunk Offline
pkunk  Offline
Joined: Mar 2011
Posts: 286
NM, USA
Originally Posted By: UncleDave
I ran M1 0w40 in my onan 4K "microquiet" as its pretty cheap and I always have a lot on hand.

Rotella will be fine if not great

No filter on that genset - splash only lubrication.

It does have a nice altitude adjustment on the carb.

It drinks like a sailor consuming about 1/3 GPH at a constant 3600 RPM even idling.

UD

Mine is the 5500, has a filter and runs at 1800 rpm. Much more effecient and quieter


2008 Mini Cooper Clubman (toad)
2000 Mercedes ML320
1994 Dodge 2500 Cummins
1999 Ford F53 V10 Coachman Motorhome 34ft
Re: Recommended oil for a Cummins Onan 4000k generator [Re: FermeLaPorte] #4680922
02/28/18 06:55 PM
02/28/18 06:55 PM
Joined: Oct 2002
Posts: 47,287
Duvall WA - Pacific NW USA
Pablo Offline
Pablo  Offline
Joined: Oct 2002
Posts: 47,287
Duvall WA - Pacific NW USA
Originally Posted By: FermeLaPorte
Chevron DELO would be a better fit since diesel oil is HDEO, AMsoil is boutique meaning just for show


Why do you think this?

Let's get a fix on exactly what this engine is, and I can recommend an Amsoil oil that is very stout and more suited to the exact generator application than a generic HDEO.


DIRECT JOBBER - PABLO - for all your Amsoil needs
http://oilslubesandfilters.shopamsoil.com/


Re: Recommended oil for a Cummins Onan 4000k generator [Re: Pablo] #4681081
02/28/18 10:07 PM
02/28/18 10:07 PM
Joined: Jun 2014
Posts: 19
Roseville, CA
trod30 Offline OP
trod30  Offline OP
Joined: Jun 2014
Posts: 19
Roseville, CA
Id love to hear your recommendation. I'm guessing your Small Engine oil?

Re: Recommended oil for a Cummins Onan 4000k generator [Re: trod30] #4681084
02/28/18 10:11 PM
02/28/18 10:11 PM
Joined: Oct 2002
Posts: 47,287
Duvall WA - Pacific NW USA
Pablo Offline
Pablo  Offline
Joined: Oct 2002
Posts: 47,287
Duvall WA - Pacific NW USA
Originally Posted By: trod30
Id love to hear your recommendation. I'm guessing your Small Engine oil?


I apologize if you wrote it, but exactly what engine?


DIRECT JOBBER - PABLO - for all your Amsoil needs
http://oilslubesandfilters.shopamsoil.com/


Re: Recommended oil for a Cummins Onan 4000k generator [Re: pkunk] #4690329
03/10/18 09:02 AM
03/10/18 09:02 AM
Joined: Jun 2014
Posts: 1,942
Ca.
UncleDave Offline
UncleDave  Offline
Joined: Jun 2014
Posts: 1,942
Ca.
Originally Posted By: pkunk
Originally Posted By: UncleDave
I ran M1 0w40 in my onan 4K "microquiet" as its pretty cheap and I always have a lot on hand.

Rotella will be fine if not great

No filter on that genset - splash only lubrication.

It does have a nice altitude adjustment on the carb.

It drinks like a sailor consuming about 1/3 GPH at a constant 3600 RPM even idling.

UD

Mine is the 5500, has a filter and runs at 1800 rpm. Much more effecient and quieter


You sure about that?

The 5500's Ive run are 2400 RPM units.

Quieter nicer and a big step up from that 4K for sure, but I didn't think it had an 1800 RPM head ??

UD

Last edited by UncleDave; 03/10/18 09:25 AM.

Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: Recommended oil for a Cummins Onan 4000k generator [Re: trod30] #4691492
03/11/18 12:15 PM
03/11/18 12:15 PM
Joined: Dec 2012
Posts: 562
Cave City KY
jakewells Offline
jakewells  Offline
Joined: Dec 2012
Posts: 562
Cave City KY
Schaeffer 9000 5W40.


1994 Ford F150 302 4R70
Chevron Delo SAE 30 CF/SL Fram XG8A

1978 Chevy Nova 250 I6 Borg Warner T5
Rotella 10W40 Fram XG5

Re: Recommended oil for a Cummins Onan 4000k generator [Re: trod30] #4697628
03/17/18 12:47 PM
03/17/18 12:47 PM
Joined: Aug 2004
Posts: 1,323
Michigan born but my heart bel...
JR Offline
JR  Offline
Joined: Aug 2004
Posts: 1,323
Michigan born but my heart bel...
Any 15w-40, sae30 or 20w-50 will serve you well. It is all I use in onans.
I do not own your model, but I do one two.
The one is a 4.5kw the other a 5.5kw. both have quite a few thousand hot hard florida hours on them.
I only used sae40, 15w-40, or 20w-50. Ran "3600" filters and did 150hr drains.



harvey


97 F250HD 7.3 320K 01 Astro 220K
93 metroXFi 94.5K
01 Impala 300K
04 RTV900R 1150hrs


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