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I have no objection to it being used in the driveshaft (of those models using oil there).
In fairness, I will also note here that one experienced transmission rebuilder, Tom Cutter, my words here, believes synthetic gear oil in your Airhead is not good, leading to unspecified WEAR.
How this happens is a property of the base oils & additives.
With the change back to dino oil, the seal(s) are then likely to reshape with some miles & time and stop weeping.
BMW did not restrict use of petroleum and synthetic oils, stating only to use a GL5 oil, & that it be a Brand Name (BMW-speak for "quality ").