CJ-4 5w40 synthetic opened up a huge range of options:
Shell Rotella T6
Mobil 1 Turbo Diesel Truck (aka Delvac 1)
Chevron Delo LE
Plus a LOT of others. I'm waiting for clarification about ACEA A3/B4 approval, which is mentioned at one point in the new documentation. If A3/B4 is also opened up, FCA is basically saying that any high quality synthetic 5w40 low-ash oil will do, which is even better news.