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The above link will explain it. Meets CI-4 Plus.
It is less expensive than Mobil Delvac 1 which meets up to CJ-4.
I put it in my 2004 3500 5.9 Cummins last Saturday.
A little quieter. 5W-40 Rotella T synthetic is great oil I use it in my 2002 VW Golf TDI (diesel) 180K miles, my 2003 Chevy Silverado 3500 Duramx had it since first oil change.