Don't forget about CCV issues / vacuum leaks. Take the dipstick out and put it back in while it's running to find out if the vacuum system is good. The engine pitch should change if there is vacuum pressure (this is good). If not it could be a bad CCV (especially if the plastic on the end of the dipstick is black with dirty oil). Regardless it's still not the end of the world, it'll just eat oil until you fix it. Also if you do end up buying it change the MT fluid and diff fluid immediately. Don't fall for the "Lifetime Oil" nonsense, you'll notice the difference with new oil.
2000 528i Sport Premium 5speed