I'm kind of in the same boat now.

Guy bought my car on eBay. Paid a 100 deposit through PayPal. Paid 11,900 in cash. Attempted to drive a 1972 mustang 80 miles home. I told him he was crazy, and that I hadn't taken the car on the highway in the three years I owned it. I have cash in hand and signed bill of sale.

Called me back 20 minutes later saying I can't make it home. The car is running hot (had'nt overheated) . Also said he wanted his money back. I told him to pound sand nicely. The car was paid for in cash, and he signed a bill of sale and left my property with it. Claims he's going to go through eBay to get the money back. Think he will win?

My only concern is eBay taking the money back.

Yes, the police were called and he left before they came.

He does. It ran for almost an hour in my driveway fine. He claims it was running hot but never crossed the upper limit. When I would drive it it would normally sit between 1/2 to 3/4 on the gauge.