X-Drive diff and transfer case oil change time?

[Qsilver7]

Originally Posted by cn90

...theorize that the "old" fluid becomes "more liquidy" after ___ miles. The new fluid is supposedly "tighter".

As the car is driven the computer gets used to old liquidy fluid.

So when one puts a tighter fluid in, the computer needs to be reset for the new tighter fluid.

All nice in theory. In reality, it is a worthless idea, IMHO...

This theory I presume is also used in other areas where BMW has engineered/designed adaptive behaviors...where after critical work is performed...a reset is recommended for the way clutches or similar engineering designs have adjusted to wear over time. See example below:

For example, the hydraulic transmission pressure adaptations...BMW suggests a reset after work on the valve bodies, or transmission change, or software update. Obviosly, adaptive engineering should compensate for any changes...but a quick reset after specific type of work performed probably is recommended for a quicker outcome.

My opinion as to the importance of a reset procedure hinges on the wording...when I see "recommended" or "suggested" or "mandatory"...those or key "guide" words for me.