Originally Posted by Singletrack
There IS an oil condition sensor. There is a pdf on this site that explains how it works. Maybe it isn't as advanced as you would like, but it is attempting to measure oil quality on some level.
My car has never gone the full 15k before it told me to change it - because I drive it hard...most days.
+1 .....do a little homework on this before you post. This is BMW #8 for me and they have all worked the same