The ad was split into two portions and CG welded together because the room they were doing all this in wasn't long enough. If you can find a higher resolution version of the film, watch when the muffler is rolling across the floor, the physics dont QUITE add up and the graphics look too perfect to be real.
Either way, this was a DAMN good advertisement. I wouldn't consider doing that cheating since the machine was simply too humongous. No matter, Massive credit anyways.
If I remember correctly, the reason it was 606 takes to get this was because when the whindshield wiper was suppose to do those flips in the air, it never quite did it correctly.