I recently purchased a 2013 Cadillac ATS 3.6L Premium with 2196 miles on it. Original owner was an older man who purchased it in December 2013 and passed away in October 2014. He didn't drive it often thus no oil change nor service nor recalls were completed. I couldn't get into the dealer for a few weeks after purchase so I chose to change the oil myself as I didn't want to drive it around with the initial oil from the factory. I swapped the filter out with a stock AC Delco/GM (PF2130) filter andswitched to Mobile 1 Dexos Synthetic (5W30). I guess I'm wondering, am I OK?