The Mercedes-Benz 540K (W29) is a car built by the German firm Mercedes-Benz from 1936 to 1940. Introduced at the 1936 Paris Motor Show, the Friedrich Geiger. The straight-8 cylinder engine of the 500K was enlarged in displacement to 5,401 cubic centimetres (329.6 cu in). It was fed by twin pressurized updraft carburetors, developing 115 hp (86 kW). In addition, there was an attached Roots supercharger, which could either be engaged manually for short periods, or automatically when the accelerator was pushed fully to the floor. This increased power to 180 hp (130 kW), enabling a top speed of 170 kilometres per hour (110 mph).
Power was sent to the rear wheels through a four-speed or optional five-speed manual gearbox that featured synchromesh on the top three gears. Vacuum-assisted hydraulic brakes kept the car under the driver's control.