Diesel is used in about 50 percent of cars in Europe, but only in about three percent of the market in the US. The German word Diesel was named after the German inventor and mechanical engineer Rudolf Diesel, who patented the idea for his new engine in 1895 that used diesel fuel rather than gas (petrol).
The engine works by compressing only the air and therefore does not use a spark plug to ignite the air-fuel mixture. Although the diesel engine and German car industry has taken a serious hit recently with Volkswagen's diesel emissions scandal, diesel engines are still very common across Europe.