This comprehensive workshop repair service manual provides detailed technical information for the BMW M635CSI, covering model years 1983 through 1989. It is designed to be a valuable resource for mechanics and enthusiasts alike, offering step-by-step instructions and diagrams to assist with a wide range of maintenance and repair procedures. The manual includes detailed information on engine, transmission, suspension, brakes, electrical systems, and more. It also covers troubleshooting, specifications, and diagrams for all major components, providing an in-depth understanding of the M635CSI's intricate workings. This manual is a must-have for anyone who wants to maintain, repair, or restore their classic BMW M635CSI.

The BMW M635CSi, produced from 1983 to 1989, stands as a testament to BMW's prowess in crafting high-performance automobiles. Built upon the foundation of the iconic 6 Series, the M635CSi was a performance-oriented variant that pushed the boundaries of both luxury and sportiness. It was powered by a 3.5-liter inline-six engine, code-named M88/3, which delivered a thrilling 286 horsepower and 243 lb-ft of torque. This engine, equipped with four valves per cylinder and a Bosch Motronic fuel injection system, was groundbreaking for its time and provided the M635CSi with impressive acceleration and top speed. The car's chassis was also meticulously tuned for superior handling, featuring a sophisticated suspension system with MacPherson struts in the front and a semi-trailing arm rear axle. Coupled with a five-speed manual transmission, the M635CSi delivered an exhilarating driving experience that captivated enthusiasts worldwide. Beyond performance, the M635CSi maintained the luxury and refinement expected from a BMW. The interior featured plush leather seats, a comprehensive instrument panel, and a well-appointed cabin designed for comfort and convenience. The exterior showcased a distinctive aerodynamic body, featuring a front spoiler, rear spoiler, and a unique M-badged grille that accentuated the car's sporty character. Limited production numbers and a reputation for exceptional performance and handling have cemented the M635CSi's legacy as a classic BMW model, much sought after by collectors and enthusiasts. While not as widely recognized as some of its later successors, the M635CSi played a pivotal role in establishing BMW's reputation for engineering excellence and performance, paving the way for the M-series to become a synonymous with high-performance luxury automobiles.