I have a 2015 gmc sierra with a 6.2 litre with 70k miles... I'm frustrated, I'm on my second set of lifters (16) and also camshaft.. the reason I'm writing this post is my truck has been in the dealership for going on two months... The question I have is why is gm not being held accountable for a poor design as its costing me $5500... I have been a gm person my entire adult life but unfortunately I think I'm done and I have no confidence in my vehicle anymore , I'm afraid it will breakdown again... I have seen a new service bulletin has been issued and some class action lawsuits are in the works regarding this problem ..