A friend of ours ( little old lady ) has been taking her Chevy to the dealers for all maintenance since she bought it there.
As she explained it, they always found something extra that "needed fixing or replacing" and her visits averaged $200 > $300
Last time, she balked at the estimate, and took her car to an independant garage. They concluded; a. there was nothing wrong with her brakes or bearings. b. many of the items charged had never been replaced. c. they'd do what really needed doing for about 1/4 the price.
Not only has that CHEVY dealer lost her as a customer, they've lost everyone she tells her story to.
I guess there are bad apples in every barrel.