My wife just brought our mazda 6 to the dealer with a coupon for an oil change. She returned and there was a bill for almost $600.00. The car has 37000 miles and they flushed the transmission, engine coolant etc. These two items cost $300.00. My scheduled maitenance book showed that the coolant should be changed at 105000 miles, but the transmission was not mentioned. Does anyone know what the schedule is so I can call the dealership to question this?

Thank You for any information