The Mercedes-Benz W123, produced from 1975 to 1985, is a distinguished executive sedan renowned for its exceptional durability and robust engineering. Representing Mercedes-Benz's commitment to quality, the W123 series competed in a segment that valued mechanical integrity and comfort. Known for its over-engineered construction, this model series, encompassing sedans, coupes, and estates, offered a range of reliable petrol and diesel engines, including the M102, M110, OM615, OM616, and the popular OM617 turbo-diesel. Its design philosophy prioritized safety and longevity, making it a benchmark for its era and fostering a dedicated enthusiast following.

This factory service repair workshop manual provides comprehensive, factory-level detail for the Mercedes-Benz W123 models applicable to the 1981 through 1985 model years. It covers all essential systems, including engine mechanics, fuel injection, ignition, cooling, lubrication, transmissions (manual and automatic), chassis components like suspension, steering, and brakes, as well as electrical systems and bodywork. The manual details routine maintenance procedures, in-depth repair procedures, troubleshooting guides, and diagnostic techniques, offering invaluable assistance to owners and professional technicians in maintaining and restoring the vehicle's optimal performance and condition.