The E24 6-Series, produced from 1976 to 1989, represented BMW's flagship grand tourer. Its sleek, shark-nosed design became iconic of BMW's styling in the late 70s and 80s. While European markets enjoyed a range of inline-six engines, including the fuel-efficient 628CSi, U.S. models were limited to larger displacement options like the 633CSi and later 635CSi. The crown jewel of the lineup, the M635CSi (badged as the M6 in North America and Japan), arrived in 1983 for Europe but didn't reach U.S. shores until 1987. The U.S. version retained the powerful M88/3 engine, making it one of the few M cars of its era to maintain performance parity with its European counterpart.