I just purchased some 0w40 Mobil 1 for mine. It is on sale right now at AZ. Got 5 quarts and a Mobil 1 filter for 31.99. Got the Mobil 1 filter for my other vehicle.
I have run GC in my 05 cooper s since purchase, car has 65K on it now. I would recommend changing it at 5k and skip the silly 10k interval. I usually stock up on the sales by Autozone, sitting on 50+ qts. I also use it in my suburban
I used Total Quartz Energy 9000 0W-30 in my 2008 Mini Cooper S, with a factory filter. It is LL01 approved by BMW and also by Peugeot,co developer of the Prince engine used in the second generation. I am still under warranty until the end of the year and did it between free oil changes since I did not want to wait a year for Mini to pick up the tab. http://www.performanceoilstore.com/proddetail.asp?prod=802213