This manual covers the 1985 Mercedes-Benz 300 CD, a distinguished mid-size luxury coupe from the renowned W123 generation. Celebrated for its exceptional build quality and the legendary durability of its 3.0-liter OM617.952 inline-five diesel engine, this vehicle offers a blend of refinement, comfort, and remarkable fuel efficiency for its era. Its robust construction, often earning it the nickname 'the tank', and supple ride quality made it a standout in its segment, competing with other luxury marques. The 300 CD exemplifies Mercedes-Benz's commitment to engineering excellence, providing a reliable and enduring driving experience.

This comprehensive Factory Service Manual (WSM) provides detailed guidance for the service, repair, maintenance, and troubleshooting of your 1985 Mercedes-Benz 300 CD. It covers all major systems, including the powertrain, drivetrain, suspension, steering, brakes, and electrical systems, with specific procedures for the OM617.952 engine and the 4-speed automatic transmission. With over 1000 pages of information, including wiring diagrams, technical specifications, and diagnostic charts, this manual is an indispensable resource for owners and technicians alike, empowering them to maintain the vehicle's optimal performance and longevity.