Good morning Tomoaki,
Thank you for your reply. Without feed back like yours its difficult to improve our service. I have reviewed your concern and talked with the service consultant that you delt with and indeed he made a poor choice in charging you for the different oil and we would like to refund you the amount of the extra charge. There is some discrepency in the information that we received from G.M. regarding the rebate but none the less, our lack of education should certainly not be at your expense. Please accept our apology and refund. We take the surecritic survey very seriously and if you feel that we have responded appropriately, we would appreciate it if you would reconsider our score evaluation.
Thank you for your time
Geoff Lyons Chevrolet Service Manager