Karl Benz was an auto engineer who is credited with inventing the first practical motor car. He was a German engineer and industrialist who founded the Mercedes-Benz automobile company in 1926. Ferdinand Porsche was another auto engineer who designed the first Volkswagen Beetle and founded the Porsche automobile company in 1931. DIESEL engines are a type of internal combustion engine that use DIESEL fuel to generate power. They are more efficient than gasoline engines and are commonly used in cars, trucks, and other vehicles.