I also asked Ed specifically about the 5W-40 rotella T
synthetic that I currently use. Here is his reponse:
"Shell Rotella T
Synthetic Oil has not yet been reformulated for API CJ-4, though we expect to release the reformulation in the next couple of months. At the current time, Shell Rotella T
Synthetic Oil SAE 5W-40, in the API CI-4 Plus/SL formulation, contains approximately 1600 ppm, or 0.16%,
zinc."