BIMMERPOST Review: M550d xDrive [M Performance Automobile] - 2010 2011 BMW 5 Series Forum F10
BMW B57 - Wikipedia
BMW Unveils The M550d xDrive, a 400 HP Quad-Turbo Executive Car Fit For a Family - autoevolution
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400-HP Quad-Turbo Diesel I-6 BMW M550d xDrive Unveiled
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In for an engine rebuild: my BMW M550d Touring. Factory specs: tri-turbo diesel, 0-60 mph in 4.6 s. My engine's additional spec: leaking cylinder head. : r/Justrolledintotheshop
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BMW M550d Expected To Return In 2017 With Quad Turbo Diesel Engine - autoevolution
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2017 BMW M550d: First pictures of the G30 with quad-turbo diesel
2018 BMW M550d packs four turbos under its bonnet - Drive
BMW announces quad-turbo six cylinder engine
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