Found this article, might be of interest to some. Posted also on the E89 section as it applies to both cars:
https://www.bmwblog.com/2023/04/04/bmws-n52-straight-six-is-one-of-its-most-slept-on-engines/
https://www.bmwblog.com/2023/04/04/bmws-n52-straight-six-is-one-of-its-most-slept-on-engines/