The last I heard, PC was working on getting their Duron 5w-40 licensed for the CI-4/SL rating, even though Cummins and CAT have now decided they may need to come out with new OEM specs. Apparently, the CI-4 rating isn't sufficient for all these new EGR equipped commercial engines. Cummins is looking for higher ash levels, and CAT for lower sulphated ash levels. The Duron 5w-40 is also JASO MA rated for wet clutch use ....
The 15w-40 oils are still the big money makers, so they always get upgraded first. The PC Duron, 15w-40 synthetic blend has met CI-4 and Mack EO-N, premium plus for some time now ....
Tooslick
Dixie Synthetics
[ November 13, 2003, 07:33 AM: Message edited by: TooSlick ]