BMW introduced the 635CSi in 1978 as the most performance-focused mainstream version of the first-generation 6 Series, the E24. The 6 Series itself debuted in 1976 as BMW’s new grand touring coupe, combining long-distance comfort with the brand’s sporting character. The 635CSi built on that formula with a larger, more powerful inline-six and quickly became the standout road-going version in the range.
The model is closely associated with the E24’s classic shark-nose styling, pillarless two-door body, and luxury-coupe positioning. Early cars helped define the identity of BMW’s first 6 Series as an upscale but driver-oriented grand tourer, and the 635CSi became the version most remembered by enthusiasts. It also gave rise to the Motorsport-developed M635CSi, the high-performance flagship that extended the car’s reputation into more serious performance territory.
BMW’s own history materials describe the 635CSi as appearing in 1978, and the original 6 Series production run continued until 1989, making the 635CSi part of the E24’s single continuous era. The car also earned a strong motorsport legacy: BMW campaigned the 635CSi in touring-car competition in the 1980s, where it became one of the most successful and recognizable BMW race silhouettes of its time.
When the original 6 Series ended in 1989, BMW did not immediately replace it with another 635CSi; the 6 Series nameplate returned only years later with a different generation. For many fans, the E24 635CSi remains the definitive expression of BMW’s classic six-cylinder luxury coupe.