My Dad was at a truck show and talked to one of the shell reps there. He said the new rotella only has about 800/900 ppm for better emissions control, and the old stuff has about 1200 (the old stuff is packaged with that little triangle on it...you'll know what i mean when you see it). I went to wal mart and bought a big 20L bucket of the old stuff since they still had it, but check with any truck supply place as they still probably have some as well...I also added a little bit of the lucas break in oil just to be safe