What are the differences between rear-wheel drive and four-wheel drive in the BMW 3 Series?

[Andrea]

The difference between four-wheel drive and rear-wheel drive lies in the number of driven wheels and handling characteristics. Here is some relevant knowledge about four-wheel drive systems: Definition of four-wheel drive system: Four-wheel drive means that all four wheels of the car can receive driving force. In this way, the engine's power is distributed to all four wheels, making it less likely for the wheels to slip when encountering poor road conditions, and significantly improving the car's off-road capability. Four-wheel drive systems are mainly divided into two categories: part-time four-wheel drive and full-time four-wheel drive. Classification of four-wheel drive systems: There are three common types of four-wheel drive systems in cars: on-demand four-wheel drive, full-time four-wheel drive, and part-time four-wheel drive. Full-time four-wheel drive systems are often found in some luxury SUVs and high-performance sedans. Cars equipped with full-time four-wheel drive systems have power distributed to all four wheels at all times. This type of four-wheel drive system can enhance the mechanical grip of the wheels. Part-time four-wheel drive systems are often seen in some rugged off-road vehicles. Cars equipped with part-time four-wheel drive systems have three modes: high-range four-wheel drive, low-range four-wheel drive, and high-range two-wheel drive.