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?
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?
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.
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.
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...
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?