Today I took my wife's Enclave in for its first oil change to the Buick dealer where she purchased the car. Their advertised price was $27.95. When I picked up the car the bill was for $34.95 plus tax. I asked the service writer how come and he told me it was because this was a large vehicle and they charge more for large vehicles. I told him that the service was performed on the engine and that the size of the vehicle had nothing to do with it. He then said that the engine took 5.5 qts of oil and that their $27.95 price was for grease and oil change up to 5 qts. I then reminded him that no grease was needed on this vehicle and that he was charging me $7.00 for a half quart of oil which probably came out of a bulk tank and not even noticable. I then called another Buick dealer in a small town 10 miles west of here and asked their price to change oil in an Enclave. They said it was $24.95 even after I reminded him that the manual says it would take 5.5 qts. Guess who gets my business from now on! So beware that some dealers may be using the good size of the Enclave to justify over-charging for services. I only know about the oil change price, but there may be more areas that this dealer would overcharge me on. Who knows!