 Bought 2008 CX-7 in '08 with no miles. Had no issues until June 2014 after driving the car 2.5 miles and the car started to overheat. I parked the car and took it to the dealer the next day. Diagnosis, the engine needed to relaced. Never had a check engine light warning or any other indicator for that matter. It is now October 2015, a refurbished engine and new  turbo later, the car still does't work.  The car has been operational maybe 4 months in this timeframe. A car salesman who was a friend  told me to trade it in after paying on it for 3 years back in '11 because he said these engines were bad. I wish I had listened. Mazda should be ashamed of themselves. This model's engine was a lemon.