2015 SLT Z71 4X4 Crew with 5.3, purchased in April 2015, i now have 20K miles on it and an oil leak was found by me while having the Oil changed, found out there was a service bulletin that went out saying not to tell customers of the oil leak unless it was out of warranty, at first they told me it was the rear main, while at the shop they recanted and said it was the oil pan, they resealed the pan and it leaked worse then when i took it in, they keep the truck another day and replace the pan, said the original pan was pitted and causing the leak, Just a FYI. So far this truck has had no issues other than the oil leak though and i fell it is a little sluggish under exceleration and having what i feel is stumbling before the trany kicks down a gear.