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I took my 03 Coupe to the dealership today. I had the infamous piston slap(or whatever it is) and the grinding sound from the differential on slow right turns. I brought with me the Mobil 1 oil and a K&N filter. When I got there, they had the guts to tell me that the grinding noise would not be covered by the warranty because I was 15 MILES past the warranty. I disgruntly left the car there to be worked on. They called me 2 hours later to tell me the car was done and they decided to cover the differential service. When I started the car I no longer had the "piston slap" (Mobil 1 and K&N fixed that), and I no longer heard the grinding noise from the differential. I know a lot of people are down on "Stealerships", but this one did me right.
Some aren't too bad. My car will need to see one here soon for minor rocking and possibly a transmission bug. I can only hope the one at my new residence takes care of its customers. I am currently on GMPP.