If they car wasn't driven hard the common problems you mentioned probably wouldn't be a problem at that mileage. It looks good, and should do everything you need it to. I would say change the oil more often than 10,000 miles, maybe 5,000 to 7,000. A lot of people do 3,000. I can't recall where the picture is, but gotKraut's engine in his E30 is probably cleaner then the E39 you are looking at and he has...wow bad memory... over 250, if not over 300k on it. I say definitely get it looked at again to make sure there is nothing you are missing. Good luck.