To do it yourself, click on Sell an Item (down left side of page), type 'car' into the field that asks what you're selling, then you should get a message saying that category isn't able to use the new listing format and there'll be a button to click on to take you back to the classic listing tool. There may be an extra step in the middle where you have to select a category to list the car in, so make sure you select one that's more relevant to selling an actual car.
