The Mercedes-Benz 280, part of the W114/W115 chassis generation, represents a significant offering in the mid-size luxury sedan market. Produced between 1973 and 1976, this executive sedan is renowned for its robust construction, refined inline-6 M130 engine, and sophisticated engineering. The W114/W115 line was designed to provide Mercedes-Benz quality and comfort in a more accessible package than the flagship S-Class, and the 280 model, with its powerful engine and elegant styling, epitomizes this philosophy. Its key features include a high level of interior appointments, advanced suspension for its time, and a strong emphasis on safety, making it a respected and collectible vehicle. This comprehensive Factory Service Workshop Manual provides detailed guidance for the Mercedes-Benz 280 (W114/W115) models from 1973 to 1976. It covers an extensive range of systems, including engine mechanicals and fuel injection, drivetrain, chassis, and electrical systems. The manual details routine maintenance procedures, complex repair and rebuild processes, and essential troubleshooting guides with fault-finding charts. Its purpose is to empower owners, mechanics, and technicians with the in-depth knowledge required to maintain, diagnose, and repair the vehicle effectively, ensuring its longevity and optimal performance.