This is the text from December of 2019 on their data sheet. Clear as mud.
EDGE 5W-40 U.S.
Strength for Maximum Performance
Description
Advances in engine technology have led to increased power and efficiency, meaning engines work harder and under
higher pressures than ever before. The only thing keeping engine components apart is the oil, so it needs to be strong
and remain strong. Castrol EDGE is our strongest and most advanced range of full synthetic motor oils. It provides
superior motor oil strength and helps your vehicle maximize its performance.
Application
Formulated for approved and licensed European OEM specifications. Meets industry standards for API SN/CF and ACEA
A3/B4. Meets BMW, MB, Porsche and VW specifications.
Advantages
Castrol EDGE provides superior motor oil strength for engines that work harder due to higher engine pressures,
helping your vehicle maximize engine performance.
* Reduces metal to metal contact across a range of different driving speeds.
* Protects the engine for the entire drain interval as recommended by your owner's manual even under extreme
pressure.
* Decreases engine deposit formulation to help maximize engine response.
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The specification/approval word play has been hashed out extensively on BITOG.