Change transfer case fluid, reset needed by BMW?

[newX3user]

I changed my transfer case oil around five months ago and has not reset anything. I hope it is not destroying anything. I thought as long as the oil is new the transfer case should be ok, but I might be wrong.

Also, the reset does not turn on any warning lights. It only activates an OBD code that say something about transfer case oil having excessive friction. I am sorry I cannot remember the exact wording now.

To be honest, I cannot imagine how anyone would know about this if they did not have a scanning device. I read mine because I have the Bavarian Technic device. I was resetting after an oil change and I noticed the warning. It even said the error would not cause a warning light to come on.

So, the question is: if the reset was so necessary, why doesn't it turn on a check engine light? What does the reset to anyway? Isn't the transfer case a stationary set of gears that transfers the vertical rotation to a horizontal one? What does the computer reset exactly?