Carmax has an "Autozone" inside as their parts department, when you sell a car to them, or they buy one at auction, the car comes to the Sawmill location or one of the inspection locations and it is inspected and parts are replaced with new "Autozone" parts. Some cars even get paint and body work as they have guys that do that there. Aftermarket parts are removed and destroyed. Even radios, rims, and such. If a car does not meet a certain standard it is sent to auction rather than the front lot or Morse Rd. If you are looking for a used car, it really is not a "bad" place to buy a used car for everyday use.