With its three turbochargers, the current BMW Tri-turbo diesel enjoys a special position in the high-end premium market, yet the engineers in Munich have already put together a worthy replacement. BMW is rumored will launch a quad-turbo straight-six diesel for the 2016 BMW 750d. Other future 50d models are also likely to use the same unit.

If you listen to different sources, the engine is either labeled as B57 TOP or B57S. Currently, we don’t know the full technical specs of the upcoming engine, therefore we can’t comment on whether BMW will offer four classic turbochargers or an electrically-driven turbo being added to the previous tri-turbo setup.

BMW N57S Diesel

But one thing we’ve learned this week is the power output: 395 horsepower.

The current six-cylinder in-line diesel engine comes with three-stage turbocharging and common rail direct injection. From a 3.0-liter displacement it develops output of 280 kW /381 hp and a peak torque of 740 Newton meters (546 lb-ft).

Related: Test drive BMW X6 M50d

First model to get the updated engine is the 2016 BMW 750d.

Just like the current Tri-turbo, the new BMW quad turbocharged diesel will always be linked to the all-wheel drive system xDrive.