4x4 vs. AWD

[MysticBlueX3]

Seems like this thread has brought up another issue of DSC and x-Drive. Let me see if I can get things cleared up.

x-Drive: Always on and can not be turned off. xDrive is the all-wheel drive system of your BMW X3. The all wheel drive system xDrive variably distributes
the drive torque to individual wheels depending on the driving situation and prevailing road conditions.

DSC: Normally on. Can be turned off by pushing the DSC button. 4X4 light is on when DSC is turned off. The system optimizes the driving stability during acceleration and when starting from a standstill. The system recognizes any tendency for the vehicle to assume an unstable attitude such as oversteer or understeer; it then ounteracts this tendency with a combination of graduated reductions in engine torque and selective braking intervention at individual wheels.

Now can anybody help me with my initial question? I think this is the answer.

Snow w/ no chains - DSC ON
Snow w/ chains - DSC OFF
Heavy Rain - DSC ON

Are there any other instances where you guys feel that it is better off to have DSC OFF? This is what the manual suggest.

> When rocking the vehicle and starting off in deep snow or on loose road surfaces
> On sandy road surfaces
> On poor surfaces with deep ruts
> If the wheels churn on muddy surfaces
> When driving with snow chains