Originally Posted By: Brenden
At my local GM dealer, the technician said they used M1 for their dexos 1 oil, and mobil 5000 for their dino changes, both were visible in bulk tanks from the service bay I was in, the m1 was labeled the other was not, I guess I will take his word for it though...
My local dealer also using mobil 5000 as dino and mobil 1 for synthetic. Also police car auto deparment running dino mobil 5000 and change every 5000 miles.