I have never put anything down on a car loan.typically every 1k you put down it lowers your payment 20 bucks a month.This would be the case on a 48-60 mo. loan not on a 72.This means if you put 5k youre payment would be $100 a month cheaper on a 60 mo. loan.Id personally rather keep the 5k and pay $100 more a mo.If youre buying used get a good deal,Dont put anything down and go with a shorter length loan and youll be fine.Id steer clear of a 72 mo. loan Thats a long time to finance a new car let alone a used car Thats where youll get into probs.Such as having to put money down,higher interest rates,neg equity.Thats my 2 cents and if you do decide to bite the bullet and bury yourself buy gap insurance.