The 1991 Mercedes-Benz 350 SD Turbo, designated by the W126 chassis code and powered by the OM603.960 engine, represents a significant achievement in diesel luxury sedan engineering. This model offered a blend of robust performance, refined comfort, and the enduring reliability synonymous with Mercedes-Benz. Its turbocharged inline-six diesel engine, coupled with a 4-speed automatic transmission, provided a capable and efficient driving experience, making it a distinguished competitor in the premium automotive market of its era. The vehicle's design emphasized safety, featuring advanced systems for its time, and its construction showcased the exceptional build quality characteristic of the brand.

This comprehensive factory service and repair manual provides essential information for the maintenance and servicing of your 1991 Mercedes-Benz 350 SD Turbo. It covers a wide array of systems, including the engine, fuel, turbocharger, cooling, lubrication, transmission, drivetrain, suspension, steering, brakes, and electrical systems, along with climate control and bodywork. Detailed procedures for routine maintenance, component removal and installation, major overhauls, and diagnostic troubleshooting are included, offering in-depth guidance for owners and technicians. The manual also contains technical specifications, wiring diagrams, and troubleshooting flowcharts, ensuring that the vehicle can be kept in optimal condition throughout its service life.