Quote:

The new API rating for diesel oil is CJ-4. The new CJ-4 oil is Ultra-low sulfur diesel (ULSD) for newer diesel emissions. The older API diesel oil rating is CI-4+ and is getting harder to find. In fact I talked with a parts department manager the other day who told me he cannot get the CI-4+ any longer. But there are a hand full of specialty companies still producing the CI-4+ diesel oil.

CompSyn



Depends on the weight. In 15w-40 that is true. But you can still buy Chevron Delo CI (not even CI+) in 10w-30.
So far tests have shown that Rotella and Chevron still have marginally acceptable ZN levels (1250-1500 ppm from Staveley tests) but that could change at any time WITHOUT rolling the designation to CL.