[Dante]

Well I agree with most others here - if he did not take the time to check it out beforehand - it's his mistake and he needs to be accountable for his mistake.

Anyways, chalk it up to lesson learned and I would suggest that next time you clearly state it in the bill of sale that the vehicle is being sold as-is with no warranties expressed or implied. For exact "legal language" do a Google search on auto bill of sale.