BMW has concocted a recipe that will have many car enthusiasts salivating: a diesel-powered, nearly 400-hp, all-wheel-drive, quad-turbocharged 5-series that is available as a wagon. It’s called the M550d xDrive, and it joins the V-8?powered M550i as the second M Performance model in the new seventh-generation 5-series lineup. At least it do...
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