Using no money down sets you up for trouble as soon as you drive off the lot. Second, watch your mileage. Third, buy a car with strong resale value. Saving money on the price of the car AND getting a good rate on financing means less loan to pay off in the first place. Get clobbered by the 'back-end'.
Dealers refer to the money they make after the sale as the back-end.
These items are typically sold to you by 'the Business Manager' and they can sometimes be slipped into your payments without being clearly disclosed.