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Engineering Explained on Youtube has a very comprehensive video covering this:

https://www.youtube.com/watch?v=Jk246sutET0

At a very simple level it boils down to: Do you have a transfer case? If yes, then it's a 4WD.

A transfer case is something BMW calls the thing that attaches to the side of your transmission to provide power to front wheel shafts, this does not mean the car is 4WD. Yes, still confusing.

https://awd.tech/de/apps/catalog/transmission/atc300-bmw

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