The AWD system on the 525 or 530 will be BMW's typical AWD system. It is a full-time AWD system and under normal conditions, it distributes 62% of the power to the rear and 38% of the power to the front. If any of the wheels are slipping, the system will transfer power accordingly. There is no manual control over the AWD system. The car is constantly running with that 62/38 power distribution and the system makes all the decisions when necessary.