Actually the ZDDP levels in Shell Rotella T drop a considerable amount from the CI-4 to the newer CJ-4 (triple protection stuff that is also rated "SM")!
"Just in Advance Auto Parts yesterday (ed: that was the 7th of Jan, 2008) picking up oil for my Concorde and noticed they had a good stock of Rotella-T ... and it's all CI-4. ~ $2/qt at that."
