What an amazing Cadillac!! The car being a 2007 with an estimated 80k price tag new, far from my reaches back then but as time will have it, some things are worth the wait! V8s Forever
I read that the most efficient oil for the Northstar and other newer engines is GF3 rated oils.
Mobil One is rated at GF2 while some blends and non-synthetic oils are rated at GF3.
I have been using a blend of synthetic and non-synthetic oil rated at GF3.
I don't know which is better for the...