The Mercedes-Benz SL-Class (formerly known as the SL Roadster prior to 1994) is a grand touring roadster manufactured by Mercedes since 1954. The designation SL derives from the German Sportlich-Leicht, (English: Sport Lightweight) and was first applied to the 300SL, often referred to as the 'Gullwing' due to its gullwing or upward-opening doors.The term SL refers to the marketing variations of the vehicle, including the numerous engine configurations spanning six design generations.