You wanna say your M3 does not see redline?
Reason why BMW moved to 0W30 FE is:
1. Better fleet MPG to satisfy EPA
2. Faster warm up for grocery getting folks.
And yeah there is difference in HTHS which is what is important if you running turbo, especially those turbos in M3.
Personally, if I had any BMW gas I would not run anything thinner then 0/5W30 LL-01, and probably would run Castrol 0W40 period like I do in Tiguan.
Oh no my M3 def sees redline regularly. But right now my car is under warranty and BMW fills is up with 0w30 when it goes in for service so thats what ill stick with, even for my interim changes. Also, I would think the fuel economy and warm up times between 0w40 and 0w30 would be negligible.
I have yet to see anyone post a harmful UOA using the BMW branded 0w30 so not sure why you think it does not offer sufficient protection. I am sure you know that BMW recommended 10w60 for the previous M3 so they are certainly not shy about recommending a heavier oil when necessary.