This manual covers the Mercedes-Benz 300D, chassis code W123, produced between 1976 and 1985. Renowned for its exceptional durability and robust engineering, the W123 is powered by the reliable OM617 inline 5-cylinder diesel engine. This vehicle represents a pinnacle of Mercedes-Benz's commitment to quality, offering a blend of comfort, safety, and longevity that has cemented its status as a classic. Its over-engineered construction and straightforward diesel powertrain make it a popular choice for those seeking dependable transportation and a rewarding ownership experience.

This comprehensive Service & Repair Shop Manual provides detailed instructions for the maintenance, diagnosis, and repair of your Mercedes-Benz 300D. With over 1000 pages of information, it covers every aspect of the vehicle, including engine mechanicals, fuel systems, drivetrain, suspension, brakes, and electrical systems. Whether you are performing routine maintenance, addressing complex troubleshooting, or undertaking a full rebuild, this manual offers the professional-level guidance necessary to keep your W123 operating at its best. Its detailed procedures and technical specifications are invaluable for owners, mechanics, and technicians alike.