Take your pick
BMW 5W-30 is what's in my M5 and that's what I'll continue to use. However, the attached file shows all approved oils for use in the S63T(U) engine.
Current: 2013 BMW M5
Previous: 2012 A7; 2011 S5; 2011 X5M; 2010 750Li; 2009 M3; 2008 X5; 2003 M5; 1998 540i 6 spd.