Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How much of a down payment for a car should I save before purchasing it?
Do you need the car, or is this an optional purchase for you?  Do you currently have a car that is in good working order? If you can continue to save for the car instead of buying now, you'll be getting interest on what you've saved -- and that's a lot better than 0% financing.