Why would Mobil 1 5w30 be factory fill whenYour Escalade came factory filled with Mobil 1 5W/30 and requires atleast a DEXOS certified motor oil. If they used a conventional NON DEXOS oil the world is not going to end and one time won't hurt. I would probably, as mentioned above, run a shorter interval then normal.
GM6094M is the recommendation?