# 2011-2018 BMW 640d Convertible The BMW 640d Convertible represents the 6 Series' grand touring prowess paired with a torquey 3.0-liter turbocharged diesel inline-six producing around 313 hp and 465 lb-ft. This luxurious drop-top blends effortless highway cruising with surprising efficiency for its size. Reviewers praise its refined powerplant, offering strong mid-range punch and respectable fuel economy, though some criticize the heavy curb weight affecting agility. The retractable hardtop provides coupe-like quietness when raised. It's famous for being one of the more elegant diesel convertibles available, though complexity and maintenance costs draw criticism. Today, it suits buyers wanting long-distance open-air touring with lower running costs than gasoline equivalents. Ideal for coastal drives and European grand touring, though potential owners should budget for premium maintenance and verify diesel regulations in their region.
The 640d's diesel engine offers excellent fuel economy but requires expensive AdBlue fluid. Potential issues include turbocharger failures, EGR problems, and diesel particulate filter clogging (especially with short trips). The retractable hardtop mechanism can malfunction, requiring costly repairs. Insurance runs high due to performance classification. Maintenance costs significantly exceed non-luxury brands.
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