I happen to have Mobil 1 Delvac ESP 5w40 on hand. This is what I would put in my 09' Duramax.
API ratings are CK-4,CJ-4,CI-4PLID,ACEA E9,E7
I'm new to the diesel world and I've been reading about 507, 50_ ratings are best for my TDI. can I use the Delvac on my TDI or should I just go buy more...