The 1991 Mercedes-Benz 350 SD Turbo, part of the W140 S-Class lineup, represented a significant achievement in luxury automotive engineering. This model, powered by the robust OM603.970 inline 6-cylinder diesel engine with a turbocharger, offered a blend of refined performance and efficiency. Known for its imposing presence, advanced technology for its era, and luxurious appointments, the 350 SD Turbo was designed to compete at the highest level of the automotive market, embodying Mercedes-Benz's commitment to quality, safety, and comfort. Its sophisticated design and engineering made it a benchmark in its class during the early 1990s.

This workshop service repair manual provides comprehensive coverage for the 1991 Mercedes-Benz 350 SD Turbo. It details all mechanical and electrical systems, including in-depth procedures for engine overhaul, transmission repair, drivetrain, suspension, brakes, steering, and the complete electrical system. The manual also covers climate control, body and chassis, and offers extensive diagnostic information and troubleshooting guides. Its purpose is to assist owners, mechanics, and technicians in performing routine maintenance, component repairs, and complex rebuilds, ensuring the longevity and optimal performance of this luxury vehicle.