I'm not really sure but from what I heard the oil used in the X is similar if not exactly the same as Castrol Fully Synthetic 5W 30 motor oil. Please verify, I could be wrong but then again I once added a quart of Castrol oil during a long trip without any negative effects.

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03 E53 (retired)
07 E70 3.0
07 335i....300hp
05 330ci ZHP