It took an hour and a half to do a simple oil chan...

It took an hour and a half to do a simple oil change and tire rotation. They also did what they called a 20,000 maintenance that was suppose to clean the sludge from the engine., I cost me another $60. I never saw on my bill where they used any type of solvent or cleaner to accomplish this. As far as I know they just charged me $60 extra for nothing. They never once came & told me how much longer it would be or even when it was done. After an hour & a half I went to the service dept. to see how much longer it would be. Low & behold they had just gotten the paper work & it was ready to go. I wonder how much longer I would of had to wait had I not gone & asked about it. No, I don't like their service & wouldn't buy a new car from them. I took it to them because it was close. I won't make that mistake again.