Well, BMW engines use basically same oil, regardless of an engine since 2009 in EU at least: LL04, whether engine is 3 or 12 cylinders, except M models at that time.That I did not know. Thanks for that info. Still, drawing comparisons to a power dense jz and b58/48 and saying that it would require same oil just because it's modular, is silly.
Now, what exact difference between B48 and 58 is I don’t know, but I would say it is to be expected some parts will be.
The thing about this generation is that it is developed with tuners in mind. So actually all versions are capable to sustain extreme power for their size or similar per liter.