This comprehensive workshop service repair manual is your ultimate guide to maintaining and repairing your Mercedes Benz W116 300 SD, covering model years 1978, 1979, and 1980. Whether you're a seasoned mechanic or a DIY enthusiast, this manual provides detailed instructions and illustrations that demystify every aspect of your vehicle. Dive into the intricacies of your 300 SD with sections dedicated to general maintenance, troubleshooting, engine service and repair, transmission service and repair, the brake system, wiring diagrams, the electrical system, suspension, periodic lubrication, steering, the cooling system, fuel injection and fuel system, the emission system, heater and air conditioner, engine control system, chassis and body, restraint system, interior, differential and drive, and axle. The manual utilizes numbered instructions, detailed illustrations, drawings, photos, and enlarged insets to guide you through each procedure step by step. Notes, cautions, and warnings throughout each chapter highlight critical information, ensuring a safe and successful repair experience. A numbered table of contents provides quick and easy access to the information you need.

The Mercedes-Benz W116 300 SD, produced from 1978 to 1980, stands as a testament to the German automaker's commitment to engineering excellence and luxury. This model marked a significant departure from the traditional gasoline-powered Mercedes-Benz lineup, introducing the world to a diesel-powered luxury sedan. The 300 SD was powered by a robust 3.0-liter five-cylinder OM617 diesel engine, renowned for its durability and fuel efficiency. This engine, coupled with the W116 platform's robust construction and advanced suspension, delivered a refined and comfortable driving experience, setting a new benchmark for diesel-powered luxury vehicles. Beyond its mechanical prowess, the 300 SD offered a level of comfort and refinement that was unmatched in its class. The interior featured plush leather upholstery, wood accents, and a comprehensive suite of amenities, including air conditioning, power windows, and an AM/FM radio. The W116 300 SD's elegant styling, characterized by its graceful lines and distinctive grille, further cemented its position as a symbol of automotive prestige. While the 300 SD was initially met with some skepticism due to the perceived limitations of diesel technology, it quickly gained a loyal following for its fuel efficiency, durability, and luxurious features. The 300 SD's success paved the way for Mercedes-Benz to become a leader in the diesel-powered luxury car market, setting the stage for a new era of automotive innovation.