I usually buy used cars from private parties. But I am going to my first dealership for a new car in a few days, any advice? When I buy used, I usually show up with no notice so I can check out the used car when it is still cold instead of letting the owner warm it up. Since I am buying new, should I schedule an appointment to not piss them off or go the same route as if I was buying a used car to test it for any defect? Any other advice would be great!