I have a friend of a friend who works for Lubrizol who knows more about oil than anybody else I know, so I decided to ask him about CJ-4 versus CI-4 in pre 2007 diesels. I forwarded the previous link from here referencing that CJ-4 was not backward compatible and showed higher signs of bearing wear and he told me that was probably NOT a statement from Lubrizol. He also forwarded me this link, which as you will see is definitely Lubrizol's formal statement concerning the CJ-4 spec. He basically told me not to be afraid of "the new stuff" in "my old stuff", he was a little surprised that any of us would notice down in the "diesel basement". Yes, I told him to keep his newer, nicer, more complicated and harder to work on junk.
Enjoy
R. J.
http://www.lubrizol.com/CJ-4/faq.asp
Enjoy
R. J.
http://www.lubrizol.com/CJ-4/faq.asp