The remarkable Real Time™ 4-Wheel Drive system, available on all CR-V trim levels, increases drivetrain efficiency, decreases noise and vibration, and only operates in 4WD when necessary. Here is how it works: When there is insufficient traction at the front wheels, the Real Time 4WD™ system automatically uses dual hydraulic pumps to transfer power to the rear wheels. There is no need for driver intervention. The greater the degree of front-wheel slippage, the more torque is directed to the rear wheels. Best of all, Real Time 4WD™ requires little maintenance, and in 2008, this 4WD system was further improved for better performance on adverse road conditions.