This comprehensive workshop service repair manual provides in-depth technical information for the BMW 635CSI and M635CSI models manufactured between 1983 and 1989. It covers all aspects of maintenance and repair, enabling you to confidently diagnose and fix problems with your vehicle. The manual includes detailed instructions, illustrations, and diagrams, offering step-by-step guidance for a wide range of procedures. From basic maintenance tasks like oil changes and brake adjustments to complex repairs like engine overhauls and electrical system troubleshooting, this manual is an indispensable resource for both professional mechanics and dedicated DIY enthusiasts. Its 871 pages are packed with valuable information, ensuring you have the knowledge and guidance to keep your BMW running smoothly for years to come.

The BMW 635CSi and M635CSi, produced from 1983 to 1989, were high-performance luxury coupes that solidified BMW's reputation for engineering excellence and driving pleasure. The 635CSi, powered by a 3.5-liter inline-six engine producing 218 horsepower, offered a blend of refined luxury and sporty performance. It featured a comfortable interior with plush leather seating, a sophisticated suspension system for a balanced ride, and a distinctive exterior design that captured the elegance of the era. However, it was the M635CSi that truly captured the essence of BMW's motorsport heritage. The M635CSi, a limited-production model, was essentially a road-going version of the legendary BMW M1 supercar. It received a significant power upgrade, boasting a 3.5-liter inline-six engine that delivered 286 horsepower thanks to modifications like a larger intake manifold, a custom camshaft, and a high-flow exhaust system. The M635CSi also benefited from performance-oriented enhancements, including a stiffer suspension, larger brakes, and a limited-slip differential. The result was a car that could accelerate from 0 to 60 mph in under 6 seconds and reach a top speed exceeding 150 mph, making it one of the fastest cars on the road at the time. Despite the performance, the M635CSi retained the luxurious comfort and sophisticated handling of the standard 635CSi, making it a truly exceptional blend of performance and elegance. The BMW 635CSi and M635CSi remain highly sought-after collector cars today, cherished for their classic styling, potent performance, and historical significance in the world of automotive luxury and sport.