Amsoil 15W40 CJ4 vs Amsoil 15W40 CI4+

[KevinsDMAX]

Just wondering if the new CJ4 is as good, or better than the old CI4+. I have been using RTS for the past 20K miles. With no problems, but people think that I'm crazy for using a 5w in the Texas summers.

What's ya'll opinion?

Thanks
Kevin

 

[nutsbolts]

what vehicle? you are not crazy
Javier

 

[BobFout]

Supposedly CJ-4 matches or exceeds CI-4+ in every aspect.

 

[KevinsDMAX]

Sorry...I have an 04 Duramax.

 

[BobFout]

Here's where I first found info on CJ-4 back in 2006 and 2007.

http://www.apicj-4.org/faqs.html

 

[BobFout]

There is also some discussion about 15w40 CJ-4 oils in my thread over on TDI Club.

http://forums.tdiclub.com/showthread.php?t=215098

 

[nelrod]

What difference does the 5 wt matter. At operating temp is it not a 40 wt? Please correct me if I am wrong, because I have 5W-40 Scheaffers S-9000 in my Cummins. It was 103 when I came thru Atlanta yesterday on way to Alabama. Am I missing something? Shoud Kevin and I use a 15-40?

 

[bsmith]

Anyone know the answer to this?

 

[1quartlow]

IIRC the W is a pourablility rating for Winter use...That is to say that at colder temperatures it flows or has a similiar viscosity as a 15 oil. A straight 40 weight flows at the same or close to the same over a wide range of temperatures.

 

[Johnny]

5W-40 is just fine in all of the above applications. As for as the two Amsoil oils listed, if I had a diesel that required the CJ4 spec I would use it without question.

 

[Jaymus]

Yes, do not worry about the urban legends of people saying "5W-30/40" is like water.

The 5W part of 5W-40 only applies to the cold start as far as viscosity goes. There are 0W-30's that are thicker than 10W-30's out there when it comes to being put under heat.

A different example, though, would be comparing Rotella-T 15W-40 and 5W-40.

The 15W-40 has a viscosity of 15.9cst @ 100C, while the 5W-40 has a cst of 15.5 @ 100C. If I remember correctly, the 15W-40 has a viscosity of 115cst @ 40C, and the 5W-40 is 90cst @ 40C.

 

[Gary - K7GLD]

The question I have not seen covered, is exactly WHAT differences component-wise, between Amsoil's earlier plain CI4, and the later CI-4Plus? In the DELO 400 I use, the major difference is the addition of Moly and Boron in the CI-4Plus - what did Amsoil change between the 2 oils? And unfortunately, in the DELO 400, when the later CJ stuff was introduced, the absence of the Moly, Boron and Zinc anti-wear compounds was quite obvious...

So, my NEXT question is, HOW can the later CJ oils match the anti-wear capabilities of the CI-4Plus lubes, when they REMOVE significant wear-reducing compounds? Even the makers seem sensitive to that fact, by recommending shorter change intervals...

 

[D-Roc]

Delo still has the moly and boron, but it's less moly and more boron...they (Chevron) kind of did a 180 on those two.
They're still there, but I hear you, they are in lesser amounts.
The ZDDP hasn't seemed to drop that much. I did a CJ4 Delo UOA and it was a tad lower, but not huge.
I wonder what the new PC10 formulation will be like?