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In the USA, Ashland (Valvoline/Zerex) is the OEM for BMW dealer fluids, except for the special 10W-60 for M3s and M5s, supplied by BP Germany(Castrol RS).
Are you saying the current BMW 5w-30 high performance motor oil is actually Valvoline?
If that is the case, then Valvoline might be disappointed to see the Castrol logo on those oil bottles (on the ones I've seen).