BMW 5 Series adopts ZF 8HP series gearbox; In addition to bearing more torque, the transmission ratio of the gearbox is further optimized, and the engine speed is lower at the same speed, which is more conducive to fuel consumption performance.

HP ZF 8 is an eight-automatic transmission designed and manufactured ZF FI. Its main purpose is to improve the fuel economy of vehicles. Compared with ZF 6-speed transmission and 14% modern 5-speed gearbox, it can save 1 1%. Due to the change of internal design, the transition period is reduced to 200 milliseconds; In addition, the device can shift gears in a non-sequential way, and in extreme cases, it can shift from the eighth gear to the second gear.

The second generation of 8 HP products was released on 20 14. The original design of efficiency improvement includes a wider transmission ratio of 7.8: 1, reducing the variable elements of resistance moment, reducing the required oil pump pressure, and expanding the use of inertia and start-stop system. ZF's estimated fuel economy is 3% higher than that of the first-generation 8 horsepower kit. Improvement also makes vibration.