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I'm not sure how much this helps but I'll post anyway. I have a 2021 540i and I'm getting ready to do a transfer case (a.k.a transfer box) fluid replacement and I had to buy a scanner (foxwell nt530 - $159) just to command the car to open up the transfer case fully to pull fluid from the drain/fill plug. Bimmerlink would not do it.
So not sure if you need to do that for a 2018. Conversely I did NOT need the scanner tool for my wife's 2016 X3 transfer case.
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