buyer/seller integrity question

understand straight from the jump that you owe him zero-point-zero. it's a used car and he didn't do, ask or want a further inspection. your ad was perfectly transparent. the due diligence is on him.

if bothers you and he wants to press it, tell him to bring it on back to you in the condition it left and you'll gladly refund his purchase. that's as far as i would go. if even that.