According to this thread:
http://f80.bimmerpost.com/forums/sho....php?t=1015603
... the old S65 4.0ltr.V8 is indeed al little bit lighter than the new S55 3.0ltr.I6TT - 202kg vs. 205kg !!!
Curious that BMW quotes an wrong weight for the S65 to bring the new engine below the weight of the old engine ... 202kg is for years now the official (BMW) weight of the S65 !?