BMW xDrive is an all-wheel drive system found on various BMW models since 2003. It is a permanent all-wheel drive system that ensures the best possible traction at all times, providing smooth, sporty performance. The system uses an electronically actuated clutch-pack differential to vary the torque between the front and rear axles. When driving under normal circumstances, BMW xDrive will distribute power between the front and rear axles at a 40 to 60 ratio. When the driving conditions change or if the road surface changes, this ratio will change to ensure that the driver holds proper balance and control. BMW xDrive is available on most models and is efficient, ensuring that every kilowatt of power is used effectively to guide the car on the road. BMW xDrive is ideal for driving in particular weather, such as when it rains or snows, as it offers more grip and ensures that the car is less likely to get stuck in winter conditions.