2018 BMW M550d packs four turbos under its bonnet - Drive
2018 BMW M550d Touring – Quad-Turbo Diesel Station Wagon
Spotted the Quad Turbo diesel [BMW M550D] today! : r/spotted
2017 BMW M550d: First pictures of the G30 with quad-turbo diesel
Report: BMW's Next Diesel Engine Will Have FOUR TURBOS – News – Car and Driver
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
515HP BMW M550d QUAD TURBO on AUTOBAHN (NO SPEED LIMIT) by AutoTopNL - YouTube
BMW confirms quad-turbo inline-6 diesel engine! - Team-BHP