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How much of a down payment for a car should I save before purchasing it?
If you're getting 0% on the financing, it's not costing you anything to borrow that money. So its basically free money. If you are comfortable with the monthly payments, consider going with no downpayment at all. Keep that money aside for a rainy day, or invest it somewhere so that you get some return on it. If you need to lower the payments later you can always use that money to pay down part of the loan later (check with the dealer that it is an open loan). If you're not comfortable with the payments at 0 down, put enough down to bring the monthly payment to a level where you are comfortable.