Under the Hood

The 640i is powered by a 315-horsepower, turbocharged 3.0-liter six-cylinder engine. Its peak torque rating is 332 pounds-feet. BMW cites a zero to 60 mph time of 5.5 seconds for both the coupe and convertible. The standard eight-speed automatic transmission includes steering-wheel-mounted shift paddles.

Other standard features include computer-controlled adaptive shock absorbers and Driving Dynamics Control, which allows the driver to adjust the ride quality, accelerator response, power-steering assist level and automatic transmission behavior.

Optional mechanical upgrades include active stabilizer bars and active steering, the latter of which adds rear-wheel steering to the earlier generation's variable-ratio front steering system.

    See also:

    Changing wheels and tires
    Mounting Information on mounting tires Have mounting and balancing performed only by a service center or tire specialist. If this work is not carried out properly, there is the danger of subsequ ...

    Deactivating DSC: DSC OFF
    When DSC is deactivated, driving stability is reduced during acceleration and when driving in bends. To increase vehicle stability, activate DSC again as soon as possible. Deactivating DSC ...

    Malfunction
    The small warning lamp flashes in yellow and then lights up continuously; the larger warning lamp comes on in yellow. On the Control Display, the tires are shown in gray and a message appear ...