Four wheel drive

Advantages of Four wheel drive:
              1. Increased traction is obtained from four driven wheels, which is especially useful on soft or slippery ground.
              2. If the front wheel falls into a ditch, they tend to climb out with the rear wheel drive.
              3. Wear of tires and other driveline components is shared more evenly
Disadvantages of four-wheel drive:
              1. It increases weight and bulk.
              2. It increases cost.
              3. It increases fuel consumption.
              4. It increases maintenance due to the complexity of the transmission system.
              5. Accommodating an anti-locking brake system may be difficult.