Diesel Engines

S1, E4: The 1930s saw the introduction of diesel engines in passenger cars. Back then people dismissed them as truck engines and scorned them as dirty. But those times are finally over. Diesel engines have been established for ages and even arrived in motorsports. Audi dominated the 24 Hours of Le Mans with its diesel-hybrid R18 e-tron quattro and uses this experience for future road vehicles.