The M5 is a part of BMW's "M" performance division. It is based on the 5 Series, and it includes a more powerful engine, sport tuned suspension, upgraded brakes, wheels and tires, and aerodynamically-enhanced body work. The more recent M5 models are the most powerful, but even a used M5 is a great choice for sporty luxury. Older models, from the 1980s and 1990s, were great performers in their day, but are getting harder and harder to find. Production on the M5 is in limbo for a year, as the M Division prepares a model based on the all-new 5 Series.

The last model was for the 2006 model year; its most prominent change was its V10 that could put out 500hp and 383 ft. lb. of torque. The high-revving but normally aspirated engine was linked to a seven-speed manual transmission. Drivers could choose to drive in full automatic mode, or use the paddle shifters to change gears without a clutch. However, performance was jerky during around-town driving, so M5s made in 2007 and onward were sold with an available six-speed manual transmission.

BMW included plenty of technology in the drivetrain of the M5, but its suspension sought to get back to the basics. Unlike the 5 Series, the M5 did not have run-flat tires, roll bars, or active steering. It did have well-tuned suspension, 19" wheels, and electronic dampers. It didn't give up much in the way of comfort, having an abundance of luxury features.

The M5 for 2012 is bigger than any of its predecessors, adding 55 mm in length and 46 mm width. However, the car's height has decreased by 13 mm. The wheelbase has grown by 74 mm, part of a complete chassis upgrade that gives the M5 a different stance and geometry than its four-door counterpart.