The guy who bought my S3 sent me a nasty text message this morning saying the car was fcuked and he had broken down on the M25. The car was SO reliable to me and only ever had one spot of bother from the front CV joint. I fitted a set of standard wheels to the car for the sale on the test drive the old rear tyres started to whine so i popped to the garage and pumped them all up to 32psi. noise went and he was happy, now he is trying to tell me the rear diff is fcuked I've offered to help him even though i'm not abliged to as i did sell the car with no warranty and it was a signed and sealed deal. Plus he has had the car for 1+ week. WHAT DO I DO?