Not sure if this helps, only going on what I have been told.
I am about to do the same and supply my own oil for service on a 335d. I went to purchase the SLX and was told that Castrol have stopped making it and Edge is their replacement. (Both 0w-30, both for Diesel, both recommended for BMW, both fully synthetic)
Incidently, where did you get the oil from? I am being quoted the same price (£85 ish) for oil service if i supply the oil (£230ish) if not. The oil cost me £90 - not a great deal in it, but worth the saving, I guess.
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