Formerly known as Sonderklasse, the Mercedes-Benz S-Class is a line of full-size luxury cars that are offered in both a 4-door sedan style and a 2-door coupé. Since 1972, the S-Class has been through six generations of body style and technology changes. The most recent generation, which launched in 2014. Offers a 7-speed 7G-Tronic or 9-speed 9G-Tronic transmission and is available in rear-wheel-drive or four-wheel-drive.