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Everything I have read supports what Tuner1 wrote — there is a significant variation among brands/modeks within a weight class. Significant enough that a 0W30 might indeed be close to a 0W40 depending on the brands/models compared, and also significant enough that they could be really far apart. This is regularly discussed in Bobistheoilguy.
The engine oil operating temperature in my 2018 F90 appears on the gauge to always be well over 100C. I need to use a scan tool to verify actual temp. Others have reported it is lower than indicated. But absent that verification, it seems to me these cars run hot, at least in efficient mode in daily driving. I have read that Sport Plus triggers additional cooling but do not fully understand the mechanism and whether it is for coolant or oil or both.
FE is fuel economy oil. I would expect it to be thin. You do not need to use it unless you want maximum fuel economy or are concerned about warranty claims. BMW is not specifying it because the engine requires it, but rather to help meet CAFE standards.
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