645Ci Convertible (2004-2005)

Can you afford a 2004-2005 BMW 6 Series 645Ci Convertible in 2025?

# 2004-2005 BMW 645Ci Convertible The E64 645Ci represented BMW's return to the 6 Series after a 14-year hiatus, featuring a 4.4L V8 producing 325 horsepower wrapped in controversial Chris Bangle "flame surfacing" styling. This grand tourer divided opinion with its aggressive design, though most praised its refined powertrain and luxurious interior. Reviewers appreciated the comfortable ride, impressive performance (0-60 mph in 5.5 seconds), and retractable hardtop's engineering excellence. However, the 645Ci became infamous for complex electronics and costly maintenance issues, including problematic iDrive systems and expensive repairs as it aged. Today, it suits enthusiasts seeking an affordable V8 convertible grand tourer who can budget for maintenance. Values have depreciated significantly, making it accessible but potentially expensive to maintain. Best for weekend cruising rather than daily transportation, appealing to those wanting BMW prestige at entry-level pricing.

The 2004-2005 BMW 645Ci Convertible features the problematic N62 V8 engine prone to valve stem seal failure causing oil consumption. Expect expensive repairs for the complex iDrive system, convertible top mechanisms, and run-flat tires. Insurance costs are high due to performance classification. Maintenance requires premium fuel and synthetic oil changes every 7,500 miles.

Price Range

$18,000 - $35,000

Market price for 2025

Estimated Annual Costs

Insurance:$1,200

Maintenance:$3,500

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