I bought an Audi A4 avant 2006 2.0 do from the car auctions one night got it home and all seemed good. Had a small oil leak and found it to have a hairline crack in the block fuck knows how that happened. Anyway put it back through the auctions and lost nearly 2 k on it between the buyer and sellers premium and the fact it sold for less than I paid for it.
I have bought loads of cars from auction and never had a problem till that one. I learned two things never to buy another auction car and that A4s are total shit and plagued with problems (read up a lot on them after I bought it).