CASTROL EDGE 5W-40 FST no ACEA A3/B4 ?

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So I Saw Castrol Edge on sale at tesco, wanted to buy it but when checking the specs , it has DEXOS approval but no ACEA A3/B3 or B4. I always switch between Mobil 1 0W-40, Shell Helix Ultra 5W-40 and the API SM Castrol Edge FST 0W-40. Why does the old SM have ACEA A3/B4 approval but the new one dont have this approval? Perhaps ACEA C3 is similar ?
 
The C3 has lower TBN , coupled with an Euro 4 gasoline of higher sulfur content......
I was advised by several members here that a shorter OCI may be called for.
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Edit:A3B4 is more suitable, especially with our Euro 4 RON 95, I believe.
 
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