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#4288925 - 12/30/16 01:56 PM Best oil for old 12v Cummins, extended drain???
NVRENUFF Offline


Registered: 12/19/16
Posts: 35
Loc: Conroe, TX
I'm sure this will bring all sorts of opinions but I'd like some thoughts on this. I have a couple old first gen Dodges with the 12v, one is stock but turned up a little and the other is built and runs @75psi boost and 4,200rpm. It has 140lb valve springs so it's under much higher strain than stock. All these new oils seem to trade off strength for emissions, so what would be the best oil to run long term in these old trucks? Working in the oilfield I rack up the hwy miles and have extended idle time. I've been running Rotella T6, changing the M1 filter at 6k and oil change every 12k. Looking at Mobil Delvac 1 esp, it's pricey but looks good on paper for extending drain intervals. I like Amsoil but don't like the hassle of ordering online, I prefer over the counter sales.

Thanks for any info and opinions!

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#4288933 - 12/30/16 02:06 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: NVRENUFF]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1431
Loc: Jacksonville, FL
You certainly don't need the ESP in an old 12v. The T6 is (was) a great oil prior to CK-4 so it will be interesting to see what the new spec will do to SA content that's been used for internal engine protection for years but is bad for diesel emissions equipment. Honestly any of the Majors in a CJ-4 should serve you very well. In TX you could even run the 15w40 Delvac or Delo both of which are excellent oils as is the Rotella. My personal choice would probably be the Delvac or Delo in a 5w40 or a 15w40 over the Rotella but that's splitting hairs IMHO.
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#4288937 - 12/30/16 02:11 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: NVRENUFF]
Ramblejam Offline


Registered: 11/05/13
Posts: 3212
Loc: Kentucky
http://www.swri.org/3pubs/brochure/ae/pdf/CumminsISB.pdf

The only products I've seen advertised specially for, and touting their superior performance in ASTM D7484 are:

Kendall Super-D XA
Phillips 66 Guardol ECT

These both come from ConocoPhillips, and include their "liquid titanium" additive package.

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#4288967 - 12/30/16 02:33 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: NVRENUFF]
Ramblejam Offline


Registered: 11/05/13
Posts: 3212
Loc: Kentucky
P.S. -

Originally Posted By: NVRENUFF
M1 filter

Get rid of that filter, and go with Fleetguard LF9028.

http://capitaldieselco.com/images/lube-filter/LT36043.pdf

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#4289087 - 12/30/16 04:31 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: NVRENUFF]
901Memphis Offline


Registered: 08/14/10
Posts: 12897
Loc: Northern Kentucky
Amsoil is good, order in bulk so you have a couple changes handy.
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#4289132 - 12/30/16 05:28 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: NVRENUFF]
njohnson Offline


Registered: 05/30/07
Posts: 585
Loc: Indiana
Originally Posted By: NVRENUFF
I'm sure this will bring all sorts of opinions but I'd like some thoughts on this. I have a couple old first gen Dodges with the 12v, one is stock but turned up a little and the other is built and runs @75psi boost and 4,200rpm. It has 140lb valve springs so it's under much higher strain than stock. All these new oils seem to trade off strength for emissions, so what would be the best oil to run long term in these old trucks? Working in the oilfield I rack up the hwy miles and have extended idle time. I've been running Rotella T6, changing the M1 filter at 6k and oil change every 12k. Looking at Mobil Delvac 1 esp, it's pricey but looks good on paper for extending drain intervals. I like Amsoil but don't like the hassle of ordering online, I prefer over the counter sales.

Thanks for any info and opinions!


If you really want to run the Delvac 1 ESP, and want to save some money, look for the biannual rebates Mobil is offering. They were offering rebates on the Mobil 1 oils and the Delvac Super 1300 oil for several years already. Starting in 2015? For sure, last year, they offered rebates on the Delvac 1 ESP oils. $12 off for a gallon jug (limit 5) or a $60 rebate on the 5-gallon pail (limit 2).
The rebates started in March and went through May, then, in August through October.

It makes the cost of the Delvac 1 much more reasonable.

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#4289822 - 12/31/16 03:01 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: NVRENUFF]
NVRENUFF Offline


Registered: 12/19/16
Posts: 35
Loc: Conroe, TX
Thanks for the info. My 05' LLY DMAX has 340k running plain Rotella 15/40 at 12k OCI and it's never had even a slight oil leak. Just the dmax is a cleaner running motor, the old industrial flat tappet Cummins is a different beast altogether.

I'll keep an eye out for the rebates and use them when they're available again. I'll do one 10k OCI and have it sampled, then decide from there what's best.

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#4290488 - 01/01/17 02:35 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: NVRENUFF]
Blaze Offline


Registered: 12/31/10
Posts: 1417
Loc: Washington State (East)
I ran my 12v on John Deere 15-40w.

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#4290521 - 01/01/17 03:15 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: Ramblejam]
A_Harman Offline


Registered: 10/01/10
Posts: 6950
Loc: Michigan
Originally Posted By: Ramblejam
P.S. -

Originally Posted By: NVRENUFF
M1 filter

Get rid of that filter, and go with Fleetguard LF9028.

http://capitaldieselco.com/images/lube-filter/LT36043.pdf


Yep, dump the M1 filter, and use Fleetguard Stratapores.
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2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
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#4290524 - 01/01/17 03:19 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: NVRENUFF]
A_Harman Offline


Registered: 10/01/10
Posts: 6950
Loc: Michigan
The high load valvesprings on your built 12-valve would definitely make it a candidate for a CI4+ 15w40 oil like Valvoline Premium Blue Classic, or Mobil Delvac MX (if you can still get them). I wouldn't trust modern low-SAPS oils to protect the slider followers in an application like that. Or supplement the modern oils with Redline or ZDDPlus additives.

The stock 12-valve would also be fine on VPBC.
_________________________
1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck

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#4290564 - 01/01/17 04:14 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: A_Harman]
Extreme-Duty Offline


Registered: 10/14/05
Posts: 321
Loc: Schafflund, Germany
Originally Posted By: A_Harman
The high load valvesprings on your built 12-valve would definitely make it a candidate for a CI4+ 15w40 oil like Valvoline Premium Blue Classic, or Mobil Delvac MX (if you can still get them). I wouldn't trust modern low-SAPS oils to protect the slider followers in an application like that. Or supplement the modern oils with Redline or ZDDPlus additives.

The stock 12-valve would also be fine on VPBC.


Don't let the newly formed "Pro ACEA E6 & 800 PPM P is the way to go in HDEO" group read this! I am still buying Delvac 1 CI-4+ over here, btw.
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#4290641 - 01/01/17 06:12 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: Extreme-Duty]
Ramblejam Offline


Registered: 11/05/13
Posts: 3212
Loc: Kentucky
Originally Posted By: Extreme-Duty
Don't let the newly formed "Pro ACEA E6 & 800 PPM P is the way to go in HDEO" group read this! I am still buying Delvac 1 CI-4+ over here, btw.

Man, I bet you'd hate to see CI-4+ vs. CK-4 comparative wear testing. In other words, welcome to 2017...oils have come a long way with a different approach to wear reduction:

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#4290834 - 01/01/17 10:11 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: Extreme-Duty]
Garak Offline


Registered: 12/05/09
Posts: 24779
Loc: Regina, Saskatchewan, Canada
Originally Posted By: Extreme-Duty
Don't let the newly formed "Pro ACEA E6 & 800 PPM P is the way to go in HDEO" group read this! I am still buying Delvac 1 CI-4+ over here, btw.

You're lucky you weren't here. That stuff was gone here within weeks of the CJ-4 rollout. wink
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4291005 - 01/02/17 08:15 AM Re: Best oil for old 12v Cummins, extended drain??? [Re: NVRENUFF]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5293
Loc: Fort Lauderdale, FL
I have two clients who routinely squeeze 10,000 hours out of some very heavily used Cummins QSB 5.9 engines using Amsoil 12 TBN 15w40.

At first glance you might think it an irrelevant comparison, but consider that marine 5.9's are turned up quite a bit from a land 5.9's and also see a lot of idle time.
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07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
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#4291683 - 01/02/17 09:22 PM Re: Best oil for old 12v Cummins, extended drain??? [Re: DoubleWasp]
NVRENUFF Offline


Registered: 12/19/16
Posts: 35
Loc: Conroe, TX
Originally Posted By: DoubleWasp
I have two clients who routinely squeeze 10,000 hours out of some very heavily used Cummins QSB 5.9 engines using Amsoil 12 TBN 15w40.

At first glance you might think it an irrelevant comparison, but consider that marine 5.9's are turned up quite a bit from a land 5.9's and also see a lot of idle time.

My Passat TDI is the only diesel I've ever had and not turned up, yet. Lol

My idle time is excessive. For instance my duramax had just over 19,000hrs on the motor when it hit 300k miles. Work trucks idle from 3hrs to 3 days at a time depending on the job I'm on. I'm abusive. Lol

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