A compact passenger car produced by the German brand Volkswagen (VW) in 1938-2003. With over 21,000,000 units produced in the configuration of an air-cooled rear-wheel drive rear axle engine, the Beetle was the longest-running and most-produced car model in automotive history. The car uses an air-cooled boxer engine at the rear. The body is a 2-door fastback sedan design. The body was connected to an almost flat chassis with eighteen bolts. Both the front and rear suspension use torsion bars and anti-roll bars. The engine block, cylinder heads and gearbox housing are made of light alloys. The cylinders were cast iron. The oil cooler with the thermostat ensured the optimal operating temperature and high durability
power unit. The air entering the combustion chamber was cleaned by a metal air filter and an oil bath. Although the appearance of the car has changed slightly over the years, more than 78,000 modifications were made throughout the model's production period.