A Brand New Car...

So, in this game, there are three closed doors behind one(only one) of which there is a Brand New Car. I know where the car is and you don't. And you have to pick the right door for you to win the Car.

The game is played in two stages. First you make a guess and pick one of the doors as the door with the Car. At this stage, I open one of the remaining two closed doors and show you that there is no Car behind it. I repeat - I show you one of the doors with no Car behind it. Now you are given an option to change your initial pick.

Will you?