I'm not sure what you want from me.Those people gave you advice. You came here for confirmation bias. You got advice and started to argue.
I told you what to use.
5W40 BAS is track oil (and drag is nowhere nearly as taxing on an engine as track is) made for “alcoholic “ engines like your tuned MB. It is also streetable oil.
Non tune MB can use ANY MB229.5. If you want best go HPL Euro 5W30, Castrol Edge 0W30, Mobil1 0W40, Pennzoil Platinum Euro 5W40, Motul X-Cess 5W40 GEN2.
Castrol 5W40 you are using now is just mediocre oil and it always was.
Your first post on my thread was the 36th post in total on the thread. And before I could even respond to say thanks you were jumping down my throat about being some kind of "dentist with a Porsche."
I'm retired military, I did 22 years in the Army (being called "kid" was kinda funny). If someone says something I think is wrong or inaccurate, I'm going to say something.