I had a VW GTI that I'd bought from a friend, fixed the brakes, and then scooted around for a few months in. Winter in Minnesota was approaching and I needed something more robust. It was a quirky 15 year old GTI V6 stick with 115K miles. I advertised it for sale as such. As I was selling it I had offered to help take the car to any local mechanic he'd like to check it out, no problem. He declined and bought the car after a quick test drive. I received an email from him about two weeks later and he was unhappy, he'd given it to his son and it seemed to be rapidly deteriorating, problems surfacing. He wanted to re-negotiate the price. I never returned his email.