This comprehensive Mercedes Benz W115 300D Service Repair Manual covers models from 1974 to 1976, offering detailed instructions for both do-it-yourselfers and experienced mechanics. This manual is your ultimate resource for maintaining and repairing your Mercedes Benz W115 300D, providing step-by-step instructions based on complete machine disassembly. Hundreds of pages of information, accompanied by clear photos and illustrations, guide you through every service and repair procedure. Detailed substeps expand on repair procedures, while notes, cautions, and warnings throughout each chapter highlight critical information. Numbered instructions guide you through every repair process, and bold figure numbers allow quick reference to corresponding illustrations. Enlarged insets help you identify and examine individual parts in detail. The manual also includes a numbered table of contents for fast access to the information you need. Troubleshooting and electrical service procedures are combined with detailed wiring diagrams for easy diagnosis and repair of electrical system issues. The manual covers a wide range of topics including general maintenance, troubleshooting, engine service and repair, transmission service and repair, brake system, wiring diagrams, electrical system, suspension, periodic lubrication, steering, cooling system, fuel injection, fuel system, emission system, heater/air conditioning, engine control system, chassis/body, restraint system, interior, differential/drive, and axle. This manual provides everything you need to keep your Mercedes Benz W115 300D running smoothly.

The Mercedes-Benz W115 300D, produced from 1974 to 1976, represented a significant milestone in the evolution of diesel-powered passenger cars. As the successor to the iconic W114 chassis, the W115 300D embodied Mercedes-Benz's commitment to engineering excellence and durability. Its heart was a 3.0-liter, five-cylinder, naturally aspirated diesel engine, renowned for its remarkable fuel efficiency and longevity. This engine, coupled with the robust build quality typical of Mercedes-Benz, allowed the 300D to achieve impressive real-world fuel economy, exceeding 30 miles per gallon, a feat rarely seen in contemporary cars. Despite its fuel-efficient nature, the 300D didn't compromise on performance. It offered a smooth and responsive driving experience, with a top speed exceeding 90 miles per hour, making it a comfortable and capable long-distance cruiser. Beyond its mechanical prowess, the W115 300D featured a timeless design that emphasized simplicity and elegance. Its understated lines, characterized by a long hood and a prominent grille, conveyed a sense of solidness and timeless style. The interior was equally functional and well-appointed, with comfortable seating, robust materials, and a focus on user-friendliness. Despite its age, the W115 300D remains a highly sought-after classic car, appreciated not only for its historical significance but also for its impressive reliability and driving experience. Its enduring appeal speaks volumes about the quality and craftsmanship that defined Mercedes-Benz during this era. The W115 300D continues to be a testament to the enduring legacy of German engineering and a symbol of a bygone era when cars were built to last.