I sold my Porsche 964 and the buyer now wants to reverse the sale - what can he do?

I had my 1993 Porsche 964 for sale and was contacted by an interested buyer, answered all questions asked honestly and he liked what he heard. We discussed money and he was happy to pay £13,000 after a clean MoT, inspection by himself and a test drive. He also mentioned that he would then be selling his current Porsche (a 1999 996 C2) at which point I suggested he came in the car and maybe a deal could be done regarding an exchange. We were clearly both interested in each others cars and agreed on a swap with £1000 my way. A deal was done, logbooks signed and exchanged and the buyer drove back to Cambridge (250miles).

The following afternoon the buyer contacted me saying there is oil on his garage floor and that the car did not achieve 29mpg (I had managed 28.5 computer reading over a 30mile motorway journey) on its way home and therefore wants to reverse the deal. The advert on Pistonheads did not mislead in any way and my independent Porsche garage says not to take the car back in any circumstance. I'm interested to read your thoughts.

Asked on 4 June 2011 by AQ, via email

Answered by Honest John
A private deal was done. Failing to get 29mpg is totally irrelevant. No answer to the oil stain. If there is no oil stain on your garage floor then he did something to the car that caused it. You have absolutely nothing to worry about unless he still has a key to his old car. So find a way to completely immobilise it. I suggest an enveloping steering wheel lock.
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