# 2011-2017 BMW 640i Coupe The BMW 640i Coupe represents the fifth-generation 6 Series, offering grand touring luxury with sporting pretensions. Powered by a turbocharged 3.0-liter inline-six producing 315 horsepower, it balances performance with reasonable fuel economy. Reviewers praise its refined powerplant, comfortable long-distance capabilities, and striking exterior design. However, critics note the heavy curb weight dulls engagement compared to sportier BMWs, and the rear seats are essentially decorative. The iDrive infotainment system drew mixed reviews in early years. The 640i gained notoriety for expensive maintenance and reliability concerns, particularly with electronics and the troublesome N55 engine's timing chain and oil leaks. Today, it suits buyers seeking an affordable entry into luxury GT ownership who prioritize style and comfort over outright performance. Best for highway cruising and weekend getaways—provided you budget generously for repairs.
The 640i's N55 engine is generally reliable, but expect premium costs: synthetic oil changes ($150-200), carbon buildup cleaning ($500-1000), and potential turbo/valve cover gasket issues. High insurance rates typical for luxury coupes. Parts and labor cost 2-3x mainstream brands. Budget $2000-3000 annually for maintenance beyond basics.
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