<prompt> Human: Hi all!So, Im considering buying a NEW car. Why new? Well, it might actually save me money. Id love some help muddling through it.So Im considering buying a car. I was going to buy it mildly used directly from the previous owner through a craigslist type service most people do this here in Israel. So I went to test drive the car at the dealership to see if I liked it, and the saleslady showed me a really interesting payment plan...Basically, I have the option of a no money down 0 interest finance loan. It doesnt go up based on national prime interest rates or based on inflation. So if my monthly payment is, say, 100 the first month, itll still be 100 on month 60 in a 5 year loan.So why does it seem to me like this is quite possibly worth it? Ill explain:1 Full warranty. This is a very reliable car, but a full warranty is good.2 Known car background. No chance of hijinks on a 0km brand new car, such as the former owner forgetting to mention something.3 Financial reasons: So if I delay as much of the payment for the car as long as possible, it seems to me that I benefit greatly from inflation. IE, the 100 monthly in 2014 dollars will most likely be the equivalent of much less in 2019. So, although my absolute monthly payment will stay the same, its relative value and buying power will decrease, meaning that by delaying paying for the car Ive saved money. Its convoluted, but if I understand how inflation works, I think Ive got it right.4 I get that happy new car feeling and get to choose the color. The color I love is very very rare on the second hand market.So before you say it, yes, I will quadruple check the small print. But for the moment, lets assume I understand the financing agreement correctly. My questions are:1 can anyone help me out in calculating how much Id save or lose? Id be able to compare that to a projected devaluation of the car, though I tend to drive my cars into the ground I dont really resell, I just drive em. I work with animals, so the interiors take a trashing and I truly cant afford a truck.2 If Ive got the above right, wouldnt it make more sense to take the downpayment and put it into an index fund and take the no money down option, maximizing my monthly? Then, later, I use that money and its profits to pay off the inflation deprecated car payments and pocket the difference.LAST: Heres why Im having so much trouble with the above: My instinct has always been, if you have to take a loan, make it a short one and keep the monthly as low as you can. After all I do my finances based on a monthly schedule, not a 5 year schedule. Taking a 0 no money down loan would leave me with a bigger monthly, and getting the 5 year loan makes it a part of my life for the next half decade... That just makes me feel queazy!HELP, O FINANCIAL GENIUSES AND GENIUSETTES!Assistant: We did the same thing. Dont miss a payment. You owe all the interest on the 61st month.Human: Aha. Miss 1 payment and you owe back interest?  <response>: Im pretty sure thats how it works. Though you should be able to make a double payment. The interest is deferred for 60 months. If the debt is paid by then, no worries. If not, then you owe all 60 months interest. Youll have to double check your specific terms to see what the penalties are. 