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BMW's quad-turbo diesel X5 M50d: A technological marvel

The story behind BMW's unique quad-turbo diesel engine, its impressive performance, and how it stacked up against its rivals ...
Jalopnik

BMW's Quad-Turbo Diesel Was Too Complicated (And Expensive) To Survive

In 2016, BMW unveiled its 3.0-liter inline-six quad-turbo diesel engine. The story behind it isn't quite as important as where BMW got its brand name from, but the B57S (or B57D30S0, as it was ...