Skip it and find another one. Color combo is not desirable and looks like it'll be a headache. You can find a decent priced well maintained example for a similar price. Stay away from gray seats, had them on my 330ci, they do not age very well.
Take your time and look for the right one. If its leaking oil the previous owner did not take very good care of it. Usually used car lots get the cars that people want to get rid of for various problems. Who knows what else is wrong with it. But that's just my .02