The Buick Regal is an upscale mid-sized automobile that was first introduced by Buick for the .. This was created to be the " Grand National to end all Grand Nationals." Changes made included a special Garrett T -3 turbocharger with a. BUICK GRAND NATIONAL LITRE TURBO/ T - TOPS FRESHLY PROFESSIONAL REBUILT MOTOR 27 MILES YEAR: MAKE. This Buick Grand National (VIN 1G4AKEH) is a T - top delete car with a claimed 48k miles. The seller gives a long list of.