Whoa!! That could throw up a big red flag for potential buyers. I would only hope that he wouldn't sluff off something big, bad, and ugly on the car's integrity. What's that old cliche' : "Buyer Beware"?
I hate being the eternal skeptic, but I've seen (and heard of) too many automotive atrocities commited, covered up, and denied. Johhny B. , are you listening?
Neil