The 6-Series is a range of sporty luxury coupes and convertibles made by the German automaker BMW. These models were first introduced in 1976 as a less-sporty two-door coupe model, a notch above the 5-Series in the BMW lineup. This first generation continued production through 1989 when it was discontinued. BMW reintroduced a completely redesigned and revamped 6-Series in 2003, with more powerful engines, a sportier look, and many more performance and style features to separate it from the 5-Series. The second generation was in production from 2003 through 2010 as a convertible or coupe, engines ranging from a three-liter inline-six up to a five-liter V-10.
This is the first model year for the second-generation 6-Series, reintroduced after a 15-year hiatus. Like the previous generation, these models are a more powerful and upgraded 5-Series version, but diverging at a sharper angle with styling and other features. Made for performance, the 6-Series is well-respected within its class.
Body Styles: coupe, convertible
Engines: 4.4-liter V-8
Transmissions: six-speed manual, six-speed automatic, six-speed auto-shift
Models: BMW 645 coupe, BMW 645 convertible
Where previous models were basically upgraded versions of the 5 Series, the 2004 BMW 6-Series reintroduction sets itself apart from the popular 5 Series at every turn, from more power and more technologies, to a new and sportier look.
The 645 is sporty and modern, with aerodynamic curves and a low body to cut through wind resistance. The hood and doors are made of aluminum to decrease the body weight and for better balance. It has an all-aluminum suspension to minimize weight.
The 2004 BMW 645 seats four, and is a little cramped in the back for most passengers. It features comfortable seats and different trims are available. The control layout is modeled after the 5 Series’ iDrive system, which uses a single know in the center for a range of functions.
Performance & Handling
The 2004 BMW 645 has a 4.4-liter, Valvetronic V-8 that can get up to 325-hp and can produce 330 lb-ft of torque. Drivers can choose from three different transmissions. The six-speed manual is extremely responsive and quick, the six-speed Steptronic automatic is fun to drive, and the six-speed Sequential Manual Gearbox lets the driver choose to shift or remain in automatic with shift paddles on the steering wheel or a selector lever in the center. Automatic operation may seem cumbersome at times; otherwise, it too performs well. U.S. models come with an electronic limiter, which ensures speeds stay below 149 mph; removed top speeds are considerably faster.
The 2004 BMW 6-Series engines perform well. As with the 3 and 5 Series, it is handling and maneuvering where the 6-Series is most impressive. Overall, the 6-Series is a smooth ride, except on certain surfaces, which can feel just a little rough.
All 2004 BMW 6-Series models have seat-mounted side-impact airbags and convertibles have an Automatic Rollover Protection System. BMW installed its Head Protection System, which uses inflatable tubular elements plus a stabilizing sail to increase protection on the coupe models.
EPA Fuel Economy
BMW 6-Series: 15/23 mpg city/highway
- Manual gearbox performance
- Stability and handling for RWD
- New and stylish exterior
- Convertible’s power glass rear window
You Won't Like
- Backseat room
- SMG operation when in automatic mode
- Slightly ""jittery"" on some surfaces
- Fuel efficiency
Exhibits outstanding handling and performance.
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