I have paperwork to state the I agree to pay the seller a the rest of the amount I owe them before a month is up and I wanna take it to a friend who's a mechanic to see if its worth it and they said there is no prob which I can tell by the pic there's some but I need a doc stating that if the car isn't as good as stated during sale I can return the title with getting money back or what can I do for a situation like that?