^ or on a car of any age if these terms are acknowlegded and agreed at the outset there is no problem. Particularly applies if the car is cheap, both parties appreciate it is, both parties are happy with the car and how it drives etc. and agree that a failure would be unfortunate but not the sellers fault so its their decision. They can walk away or take the deal and 9/10 buy a cheap car without major fault. Not a muppet thing to do imo when you think about it.