Good quality oils don't need any addatives. My guess is that BMW (the fine, well engineered car that it is) doesn't want any foreign addatives floating around in their engines. Most of that stuff is a gimmick any way, and some can do more harm than good.
Amsoil synthetics are European certified and have outstanding lubrication qualities. Mobile 1 is good too (I use both brands).
Use a good oil and you don't need addatives.