Castiel's Pimpmobile

Castiel's car is a 1978 Lincoln Continental Mark V.

He steals it in order to reach the Bunker in season 9 episode Road Trip, although it runs out of gas before he gets there. Castiel, Dean and Crowley later use it since Gadreel had stolen the Impala.

Castiel continues to use this car as his main mode of transportation since he can no longer fly around like all other angels. It remains in his possession for much of season 9 and 10.

In season 11 episode The Bad Seed, it is mentioned that when Metatron escaped Castiel, he stole the car. Trying to find Metatron, the Winchesters and Castiel search for the car, but can't find any signs of accidents or anything like that that Metatron may have had with the car. Castiel also gets a bit defensive when Sam calls the car "crappy."

Castiel manages to retrieve the car some time after. It reappears in the episode The Devil in the Details.

The car's licence plate is IA B2676.

Trivia

 * The car is jubilee gold in color, similar to Castiel's old trenchcoat. This explains why he likes it.
 * Crowley once called Castiel a "pimp" for choosing this car, hence the car's nickname.