The 350SDL was a diesel-engined variant of the W126 Mercedes-Benz S-Class Sedan. Introduced for the 1990 model year, the 350 SDL was built on the extended length wheelbase, and was fitted with Mercedes' OM603.97x diesel engine. This 3.5L turbodiesel inline six engine sent power through both manual or automatic transmissions to the rear wheels. Production of the Mercedes-Benz 350SDL lasted until 1991, when the variant was discontinued.