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. According to our sister magazine Bimmertoday, BMW will launch a quad-turbo straight-six diesel for the 2016 BMW 750d. The engine is dubbed B57 TOP.

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.


Compared with the Tri-turbo concept, using four turbochargers should allow an even faster response, an even broader powerband and of course an increase in power and torque. Conceivable is both a configuration with four different sized turbochargers, and a solution with two small and two large loaders.

We don’t expect a huge increase in power output, at least in his first version. We believe the 2016 BMW 750d will produce around 300 kW / 408 hp and a maximum torque of 800 Newton meters (590 lb-ft).

Related: BMW M550d Test Drive

If BMW history is an indication, then the B57 TOP will arrive in future models as well, like the G30 M550d, X5 M5d0, X6 M50d and X7 M50d.

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