The Rear Main seal failed which ended up causing issues with the timing belt and required pistons to be replaced as well. The safety of the vehicle was at risk because it was spewing oil all over the place while I was driving which could cause the roads to be slick and cause others to crash. Let alone the oil spewing everyone could cause further damage to my own vehicle. The dealer confirmed there is a bulletin for this exact issue and also advised me that in my small local area there was 6 others in the past 3 weeks who had the exact same issue. Several others I know who have this vehicle also had it happen to them within the past few years. There was 0 indication of anything that something was wrong until it just happened all of the sudden. It cost $6500 to fix and GMC will take 0 responsibility for their own willful misconduct.