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Why not pay in full upfront for a car?
You need to do the maths exactly. The cost of buying a car in cash and using a loan is not the same. The dealership will often get paid a significant amount of money if you get a loan through them. On the other hand, they may have a hold over you if you need their loan (no cash, and the bank won't give you money).  One strategy is that while you discuss the price with the dealer, you indicate that you are going to get a loan through them. And then when you've got the best price for the car, that's when you tell them it's cash. Remember that the car dealer will do what's best for their finances without any consideration of what's good for you, so you are perfectly in your rights to do the same to them.