This manual covers the Mercedes-Benz 300 CD, a luxury diesel coupe produced in 1985 as part of the renowned W123 chassis generation. Known for its exceptional durability, European engineering, and distinctive styling, the 300 CD offered a robust 3.0L 5-cylinder turbocharged diesel engine (OM617) paired with either a 4-speed automatic or 5-speed manual transmission. Its market niche was the luxury diesel segment, competing with other premium European marques. The vehicle's strengths include its reliable OM617 engine, superior build quality, comfortable ride, and strong resale value for its time, solidifying its reputation as a durable and well-engineered automobile.

This comprehensive factory service manual provides detailed information for the maintenance, repair, and troubleshooting of your 1985 Mercedes-Benz 300 CD. It covers all major systems, including the engine, transmission, drivetrain, suspension, brakes, steering, and electrical systems. Within its extensive pages, you will find step-by-step repair procedures, diagnostic flowcharts, technical specifications, torque values, and component locations. This resource is designed to assist both DIY enthusiasts and professional technicians in keeping this classic Mercedes-Benz in optimal condition, ensuring its longevity and performance.