The gold standard Audi a8 has no special significance. Audi a8 is a large car of Audi, aiming at BMW 7 Series and Mercedes-Benz S-Class. The vertical and horizontal heights of Audi a8 are 5302, 1945 and 1483 respectively, and the wheelbase is 3 128. Audi a8 uses three engines: the low-power version of the 3.0-liter turbocharged engine, with a maximum power of 2 10kw, a maximum output speed of 4,500 rpm to 6,400 rpm, a maximum torque of 450 Nm, and a maximum torque speed of 1.340 rpm to 4,430 rpm. The engine is equipped with a 48v light hybrid system and in-cylinder direct injection technology. The high-power version of the 3.0-liter turbocharged engine has a maximum power of 250kw, a maximum power speed of 5,000 rpm to 6,400 rpm, a maximum torque of 500 Nm, and a maximum torque speed of 1370 rpm to 4,500 rpm. The engine is equipped with 48v light hybrid power system and in-cylinder direct injection technology, and adopts aluminum alloy cylinder head group. The maximum power of the 4.0-liter twin-turbo engine is 338kw, the maximum power speed is 5500 rpm, the maximum torque is 660 Nm, and the maximum torque speed is 1850 rpm to 4500 rpm. The engine is equipped with 48v light hybrid power system and in-cylinder direct injection technology, and adopts aluminum alloy cylinder head group.