According to GM Vice Chairman Bob Lutz, just one car - a Chevrolet Corvette - is the only "authenticated" return under the automaker's 60-day return policy. Lutz was speaking at a luncheon event in Detroit with journalists and recounted the reason for the return as the customer was tired of shifting a manual gearbox. GM exchanged the Corvette for one with an automatic transmission. Lutz said "He brought it back because me made a mistake."