There is a sticky thread on this.
http://www.e90post.com/forums/showthread.php?t=529230
Make sure it's specified for BMW LL0-01, which is what you want if you're running your car on American gasoline. BMW LL-04 certified is not specified for use within the US due to the high sulfur content in our fuel.
More reading:
http://www.bimmerforums.com/forum/sh...l-5W-40/page3&
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