The plug-in hybrid S-Class is powered by a 328-horsepower, turbocharged 3.0-liter V-6 gasoline engine and an 80-kW (107-hp) electric motor sandwiched between the engine and an adapted version of the company’s eight-speed automatic transmission. New S 500 PLUG-IN HYBRID: The S-Class as a “three litres per 100 kilometres” car The third hybrid model of the new S-Class, the S 500