2012 BMW 6-series to get xDrive power

Do convertibles and all-wheel drive go together like oil and water, or peas and carrots? BMW seems to think the latter, with the addition of the company's xDrive system to the 2012 BMW 650i.

BMW says the all-wheel-driver versions of the 6-series are faster than the rear-drive cars. How much? A tenth of a second faster to 60 mph for the convertible and two-tenths faster in the coupe.

The xDrive all-wheel-drive system is only available with the 4.4-liter, twin-turbocharged V8 in the 650i and 650i convertible. Unfortunately, for now it's not available in the I6-equipped 640i.

By Jake Lingeman