the work invlolved to fix it & cost? It is not at all noisy but has some oily fluid around the diff but it is not dripping on the drive at all. I am trying to sell it and a guy is trying to knock me on the price because of this ?

Hi i don't know the mileage of this car any BMW as is well renown
will last the test of time to me i don't want to put this guy down but looks like he's after getting one over, i don't know may be because your a woman the oil is just a seal gone well worth doing
cost if you get a renown garage 50 to 60 quid an hours work, he may be a dealer there's a good profit in a BM !!tell him to put his money back in his pocket till it's grown !!! get an honest valuation can get a millers price guide w h smiths news agent,