This manual covers the 300TD, model code W123, produced between 1976 and 1985. Renowned for its legendary build quality and the robust, fuel-efficient OM617 turbocharged diesel engine, the 300TD represents a pinnacle of durable engineering from its era. Designed as a mid-size luxury sedan or wagon, it offered affluent consumers comfortable, reliable transportation, distinguishing itself with advanced safety features for its time and a sophisticated ride. Its enduring appeal stems from its exceptional longevity and the practical benefits of its powerful yet economical diesel powertrain.

This comprehensive factory service and repair manual provides detailed information for the maintenance, diagnosis, and repair of your 300TD. It covers all major systems, including the OM617 engine, powertrain, chassis, and electrical components, offering step-by-step procedures for routine maintenance, troubleshooting common issues, and complete overhauls. Technical specifications, torque values, fluid capacities, and wiring diagrams are included to ensure accurate and efficient service. This manual is an essential resource for owners, mechanics, and technicians seeking to maintain the performance, reliability, and longevity of their W123 300TD.