Is the BMW X3's on-demand four-wheel drive normally rear-wheel drive?

[Pierce]

The BMW X3 features an on-demand four-wheel drive system based on a rear-wheel drive platform. It utilizes a transfer case with the code name ATC13, equipped with a multi-plate clutch central differential. The four-wheel drive system of the BMW X3 can continuously adjust torque distribution according to road conditions, intelligently delivering the most suitable torque to the front and rear wheels. By default, the torque distribution between the front and rear wheels is set at 40:60, with the maximum torque distribution ratio ranging from 0:100 to 100:0, and torque distribution can be completed within 0.1 seconds. How the four-wheel drive system works: When the vehicle is traveling at high speed, the system may detect potential understeer, in which case it reduces the torque allocated to the front axle, effectively transmitting almost all power to the rear axle to ensure driving stability. When the vehicle experiences wheel slip, all four wheels can achieve stronger traction under varying drive torque, thereby preventing wheel spin.