Thanks!
And yeah, there was definitely some deliberation about moving on.

I'm thinking it's not a fluid issue either. Which sucks, but it's not my primary vehicle, as I've got a few old Audis sitting around. So that will give me more time to figure out what the issue might be.

I see a lot of acronyms/names thrown around with the BMW testing tool. For example: INPA. But then I see some posts that say they don't work to reset transfer case and transmission adaptations. So I'm most likely going to buy a Foxwell NT510. Hopefully that will do all the above.

I guess I'll have to start to consider transfer case rebuild or replacement.