The Mercedes-Benz W114 and W115 models, produced from 1968 to 1976, represent the first generation of mid-size sedan and coupe offerings. These vehicles, including variants such as the 220, 220D, 230, 240D, 250, 250C, 280, 280C, and 300D, are renowned for their robust engineering, exceptional durability, and pioneering safety features, embodying a commitment to quality and reliability. The W114 chassis code denotes the six-cylinder models, while the W115 chassis code designates the four-cylinder variants, both contributing to an esteemed reputation in the automotive industry. This comprehensive service and repair manual provides factory-level, detailed information for every aspect of the W114/W115. It covers extensive maintenance procedures, including factory schedules and fluid specifications, alongside complete step-by-step repair instructions for all major systems such as the engine, brakes, transmission, suspension, and electrical systems. Additionally, the manual includes in-depth troubleshooting guides, diagnostic procedures, detailed wiring diagrams, and precise torque specifications, empowering owners and technicians to maintain, diagnose, and repair these classic vehicles effectively and efficiently.