The other thing to think about is maybe while he wasnt entertaining the thought of selling it until you showed up,Loose lips sink ships.All it would take(and people do talk)is for him to tell one of his buddies,cousins or family members in passing"I think I'm gonna sell that Cuda"and your left with Nada!Someone will say I want that car.Or he tells one of them he is selling it for 3500 and he is told how much they are really worth,then your also screwed.Trust me it has happened to me,but i dont let them get away anymore,cash on the spot,I wont even wait for another day to pick it up,i call a tow truck or drive it now so people cant change their minds!Money talks BS walks