Part 1 of the Mobil 1 Car Swap:  Tony Stewart and Lewis Hamilton check out each others machinery at Watkins Glen International, and make sure they are both comfortable and safe before the main event begins and they finally swap cars.  

In this clip you can also experience what it was like for former F1 star David Coulthard as he test-drove the Watkins Glen circuit in a NASCAR stock car.

Watch Part 2 here