I just wanted to let you know that after the numerous discussions and questions that have been fielded in regards to what types of oil can be used in current BMW models I went ahead and discussed these issues with some sources. After several weeks I am pleased to announce that BMWUSA will soon be adding a page to their website with the oil requirements. They have been working on it and have an understanding of the issues enthusiasts are having with making sure the proper oil is in the car. The issue will be further muddied when the diesels enter the states.
My sources indicate that part of the issue in the US is the sulfur content in the fuel being variable and inconsistent based on where the fuel was refined and where it will be used. BMW is taking a conservative approach and has successfully identified certain characteristics and types of oil that will work across the spectrum.
I will further update as more information comes in.