To be fair, every dealship I've ever dealt with is the same. They under pay and under train their mechanics and so have lots of problems, but the real issue is

To be fair, every dealship I've ever dealt with is the same. They under pay and under train their mechanics and so have lots of problems, but the real issue is that they have huge incentives to intentionally screw you over as soon as the warranty period is over: they can sell you a new car. I don't drive any more, but when I owned a couple of cars. The first time it happened the dealer told me I needed new brake rotors. I thought it was kind of strange, but was too preoccupied with my 80 hour a week job to think about it. When I picked up the car, I said, "Just put the rotors in the trunk." because I naively thought that it would be my responsibility to dispose of them. All of a sudden they turned on me and started demanding why I didn't trust them -- which, of course, made me suspicious. I eventually got the rotors after threatening the manager with calling the police and took them to an independent mechanic. Of course they were perfectly fine. Latest was my wife's car a couple of years ago. My wife took her car to the dealership to change the oil. When she got her car back they told her, "We were looking at your car because your a car inspection is coming up" (In Japan you have to have an inspection every few years and fix whatever the inspector says). They told her it would cost more than $5000 to fix everything, and suggested that they had a wonderful used car that they could do a nice deal on in a trade. That way she could avoid the cost of the inspection (wonderful chaps). So she said she would think about it. When she got home, I noticed an small oil leak and told her to get them to fix it. She drove back and they refused. "It's an old car", they said. "There is nothing we can do. You should trade it in because it will save you lots of money. But anyway, it's only a small leak, so just top it up every week." My wife is Japanese and trusts people... sigh... Anyway, about a month later, no surprise, the engine light went on. She took it in to the dealership: "Oh the battery is dead. You have to buy a new one. Also, there is a serious problem with the electrical system. It will cost $2000. Why don't you just trade in your car for this younger model?" Luckily, down the street from us there was a young guy who was just getting started setting up his own shop (he was working out of his home garage until he could raise enough money to rent a building). I asked him to take a look. Sure enough: the oil pan was over tightened, which cracked the gasket. Oil leaked on the battery lead, which corroded the insulation. This caused a short. It needed a new battery lead and a new oil pan gasket. He also did the car inspection and fixed everything up... all for $800. TL;DR: Never do your repair work at the dealership. It should be obvious, really. It is run by the same people who sold you the car -- they are out to screw you over no matter how they can do it.