I was wondering how many of you are using the Mobil 1 oil filter? I have used them for years on all of my cars except the Traverse. I was concerned about a warranty issue if GM finds a non oem filter on it. My oil analysis shows that the PF48 is doing a good job but in my opinion the Mobil 1 is a better filter. My dealer said that its OK to do the OC myself, I just need to keep receipts, use the AC Delco filter and Mobil 1 oil is OK to use per GM. I took it all with a grain of salt knowing its coming from the dealer.