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BMW 7 gets quad-turbo six-cylinder diesel

The engine is only offered in Europe for the time being.

BMW is putting the final touches on the world's first quad-turbocharged diesel engine.

The mill is being developed to replace the triple-turbocharged 3.0-liter straight-six that was introduced in Europe four years ago. It retains its predecessor's 3.0-liter displacement and straight-six configuration, but it generates 394 horsepower from 4,000 to 4,400 rpm and a volcano-awakening 561 pound-feet of torque from 2,000 to 3,000 rpm. BMW explains the engine is capable of generating a lot more torque, but the ZF-sourced eight-speed automatic can't handle more.

The oil-burner will make its debut between the fenders of a new 7 variant called 750d xDrive. The all-wheel drive sedan will hit 62 mph from a stop in about 4.5 seconds, roughly on par with a Porsche 911 Targa, and go on to an electronically-limited top speed of 155 mph. The six is more efficient than its predecessor, though official fuel economy figures haven't been published yet.

Later on, BMW will drop its new straight-six under the hood of the X5, the X6, the upcoming X7, and the next generation of the 5 Series that will bow in the fall at the Paris Auto Show. BMW remains committed to selling diesel engines in the United States, but it's too early to tell if we'll see the quad-turbo six land on our shores.

Note: BMW 750i pictured. Photos by Drew Johnson.

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