We got one free oil change when we bought our 19' terrain denali.. So I took it in just shy of 3,000mi. last Oct and they did the service.. I got home, let the car cool down completely and checked to the dipstick.. It was just barely shy of the full line.. I was happy and assumed they'd done a good job.. I also climbed under the car to check to see if they actually gave me a new oil filter (I marked the old one with an X scratched into it).... yep, new filter... I just got done doing the second oil change on the vehcile. I didn't take it in because I believe the dealer uses a bulk synthetic blend and I want full synthetic. The OLM was down to 24% after just 2,400mi. but 9 mo. time had elapsed.. If they OLM counts calendar time this would make sense.. I put the car up on my ramps, climb under it to see what size socket I will need for the drain plug.. To my surprise, I find a very marred 15mm drain plug, as if the tech who did the 1st oil change had used and adjustable wrench. I then see I can't get my 15mm socket on the bolt w/o first removing a cross member aft of the drain plug... I believe the tech didn't want to be bothered to remove the cross member so he used either an open end wrench or an adjustable or maybe an SAE wrench instead of metric. The drain plug was extremely tight, I don't know what the torque on it is suppossed to be but the guy went gorilla on it. I was fortunate to get it loose due to the fubared plug.. Next was the oil filter which was also way over tight.. I couldn't believe a tech would do that. I'm sure if I complain they will accuse ME of buggering up the drain plug and then probably tell me the oil filter is meant to be over tightened as well as the drain plug.. This the first new car we've bought from this dealer and it's a bummer because they are close to home and convenient.. Oh well, same old story with dealers I guess, at least this one..