Please before you make another post, hit up google. Oh wow.. You have absolutely no idea - yes they used mg cos its lighter, but they used it AND alu because alu is stronger for the stuff that needs more strength, where tey can't use any OTHER materials as when te block gets hot, both mg and alu have same thermal expansion properties, they work well together
Diamond shaped as in they taper into the middle
The big point here is all the internals (cylinder walls, everything) are made of aluminium.. The mg just WRAPS around it all
On the aubject of o2 sims, they don't wearout, theyre a metal tube
Not forged, billet cnc'd
You'll see whether or not the n52 can take decent power soon enough. There is absolutely NO solid proof of anyone trying and failing yet
And i can't find anything on it being a 100% green engine.. Yeah they have all their 'green' tech in it, but it was designed for total performance. Fuel efficieny via light weight and response, valvetronic is both for power and efficiency for example.
Highway it uses 7/100 sure, (litres) but cane it on the track and it's more like 35/100 lol