The exact car used in the film was in an X-Files episode
Throughout the film, it’s not like the 1973 Gran Torino the Dude drives is in particularly great shape, and it gets worse as the movie progresses. The final indignity the car suffers, however, was reserved for years later. It made a brief appearance in the 1999 buddy-cop film Blue Streak, and then was wrecked while filming the 2001 X-Files episode “Salvage.”
However, the car lives on in a 1/43 scale diecast model, so this isn’t entirely a sad ending for the poor, beleaguered vehicle.