It really depends on what you are getting for your money. When I worked at a dealer many of the "mechanics" were ripping off customers on "tune ups". Often they would install a new set of plugs in it and call it done. Others would replace the wires, pcv valve, adjust idle, check vacumn canister, etc. Plus you have to wonder about the replacement parts. I know of an instance when a customer was sold a geniune "GM" plug wire set for $135.00 and actually got a parts store $35.00 set instead. There are many people out there with no scruples. A friend of mine owned a Mercedes. He told me he didn't have a problem with the dealer charging him $4000.00 for the tune up, but when he went behind them and found service items that were never performed....