Quote:
Originally Posted by dingolfing
The block is the only thing that both engines share. The S63Tu is vastly different than the N63.
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Yep, the "Tu" added Valvetronic, which neither the N63 nor original S63 have. I am not saying that this in and of itself means that the S63Tu, with so much more power than the N63, could somehow be more efficient than it. I personall doubt that, too. But it at least seems plausible that it could.
I suspect soon the the N63 will gain Valvetronic (7 series LCI? 5 series LCI?), and also the original S63 in the X5 M and X6 M will be replaced by the new Tu.