Engine oil cj-4 vs ck-4

Robby Avery

Robby Avery

GM TECH @ FENDER GMC
Jul 31, 2008
820
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Norman Park, Georgia
My oil change light came on two days ago in the lb7 so I went today to get my usual oil and filter and found that chevron delo 400le is not on any shelf walmart AutoZone orelieys or any where what is the difference in the ck-4 vs cj-4 I don't want synthetics I want the conventional delo 400 le 15w-40 what gives with this new oil anyone else aware of this
 
THEFERMANATOR

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
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They stripped zinc and phosphourus out of the oil(the impact additives that allow oil to act as a barrier) to help with emission equipment life primarily. They also made changes to it to supposedly extend the drain intervals, but some changes to it are supposed to reduce hot oil pressure. Ford has not approved many ck-4 formulations, and is still selling cj-4 oil under the motorcraft brand. It's a similiar change to the one that occurred in 06 to s rated oils for gas engines, and it was largely attributed to rapid valve train wear and wiped out cam lobes in non roller motor engines.
 
PureHybrid

PureHybrid

Isuzu Shakes IT
Feb 15, 2012
3,517
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Central OH
Time to stock up on Lucas Magnum HD :thumb:

Although I was lucky enough to find some of the "older" Delvac hiding in the back shelf at Rural King last week.
 
C

Cougar281

Well-known member
Sep 11, 2006
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St Louis, MO
As Ferm basically said, more recent oil specs are geared towards emissions junk. The 2010 TDI jetta my wife had required an 'ESP' oil that cost more than the 10qts of Delvac1 5w40 for my truck, but for half the oil!

Sent from my 2PS64 using Tapatalk
 
THEFERMANATOR

THEFERMANATOR

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Last I seen the ck-4 spec had it at 800/830 for zinc and phosphourus, same as the 06+ s rated oils. Cj-4 was 1200/1260 I believe for zinc and phosphourus, and prior to cj-4 in 06 it was 1400. I know Ford has shown quite a bit of concern over the ck-4 spec, but I haven't seen anything from GM and Cummins so far about it. You can also buy a bottle of zddp additive to add to your oil(lucas and comp cam both make one). I just used the last of my cj-4, and I'm not looking forward to buying oil for my next change. If I had known sooner, I would have bought a few cases of 15w40 at sams last year when it was on sale.
 
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FSUwelder1212

New member
Oct 18, 2012
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THEFERMANATOR said:
Last I seen the ck-4 spec had it at 800/830 for zinc and phosphourus, same as the 06+ s rated oils. Cj-4 was 1200/1260 I believe for zinc and phosphourus, and prior to cj-4 in 06 it was 1400. I know Ford has shown quite a bit of concern over the ck-4 spec, but I haven't seen anything from GM and Cummins so far about it. You can also buy a bottle of zddp additive to add to your oil(lucas and comp cam both make one). I just used the last of my cj-4, and I'm not looking forward to buying oil for my next change. If I had known sooner, I would have bought a few cases of 15w40 at sams last year when it was on sale.
Click to expand...

If you are worried about it, there are still some legacy CI-4, CI-4 plus oils still out there. Mobil delvac MX 15w40 is one, I'm thinking about giving it a whirl on my LML for my next oil change.
 
BoiseRob

BoiseRob

Active member
Oct 12, 2007
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The zinc and phos are lower to reduce the impact on the catalytic converters similar to reduced sulfur in fuel...
 
THEFERMANATOR

THEFERMANATOR

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Zddp(zinc and phosphourus) are impact additives. They were added to oils to allow the use of more aggressive cams with flat tappet cams and to allow stamped rockers to live. In the 80's to 90's cat converters were failing at high rates and it was found that the zddp was coating the catylist matrix and leading to the failures. So it was removed from s rated oils to extend the life of the cats. Now that diesels have all kinds of emissions eauipment in the exhaust, the same concerns were now with c rated oils, so they reduced the levels to protect the exhaust emissions equipment.
 
Noreaster

Noreaster

Active member
Jun 13, 2007
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Cape Cod,MA
I run Cenpeco 15-40 oil cause l have older trucks
Its CI-4 rated so it still has the good stuff in it
the price isnt bad but the shipping makes it pricey
 
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