Traded in my truck for a 2021 Mercedes C63 S sedan, which will be my first-ever Mercedes. I've owned BMW and Audi in the past and am fairly familiar with the German uber sedans. 
Who is making the OEM Mercedes oil? I see Mercedes is aligned with Mobil 1 and I believe this motor (M177) requires 229.5. There is an "AMG High Performance" motor oil which is 0w40, and a non-AMG which is 5w40. The specs on the 0w40 look similar to M1 but the kinematic viscosities aren't exactly the same.
Pic of the new whip below.
Who is making the OEM Mercedes oil? I see Mercedes is aligned with Mobil 1 and I believe this motor (M177) requires 229.5. There is an "AMG High Performance" motor oil which is 0w40, and a non-AMG which is 5w40. The specs on the 0w40 look similar to M1 but the kinematic viscosities aren't exactly the same.
Pic of the new whip below.