Originally Posted By: Hammer
CI-4 and CI-4+ were out a couple years ago. The "+" was basically a corrective action to tweak CI-4 because it wasn't originally working as well in as it was designed for. The NEWEST rating is CJ-4. It has a lower limit of phosphorous and Zinc and the Sulfated ash is capped a 1.0% unlike the previous 1.5%. There are some other differences too. Many think because the phosphorous and Zinc are lower, that the oil has gone backwards in performance. the truth is that wear is better because of the use of more modern ashless anti-wear chemistry as well as the use of better better base oils.
Hammer
My question on CJ4 is this "If it wears better, has better base stock, and has an improved additive package - why didn't the cost go up from the CI4+ pricing?"
I know that the change was required for the 6.4L and the Particulate filters. Seems like it is too good to be true - A change that was required, which reduced a proven additive, that just happens to be better for the previous applications also - AND we get it all with NO price increase. I am still a little skeptical, but still open minded.