Currently reading: BMW working on new 400bhp quad-turbocharged diesel engine
New quad-turbo diesel engine will get its first outing in a performance version of the new 7 Series next year

BMW is putting the finishing touches to a new quad-turbocharged, in-line six-cylinder diesel engine for use in a number of high-end models, sources close to the German car maker have revealed

The new performance-orientated oil-burner is planned to get its first airing in a newly created 7 Series M750d model planned for launch in 2016. 

Set to replace BMW’s existing tri-turbocharged diesel, the new quad-turbocharged engine is claimed to boast a capacity of 3.0 litres and develop well over 400bhp and 590lb ft. 

Details remain scarce, although sources suggest the new engine could build on the tri-turbo unit used in the M550d and X5 xDrive50d M-Performance by adding a small electrically driven turbocharger to increase low-end boost pressure and provide added punch. 

Alternatively, BMW could improve induction qualities by using a fourth conventional gas-driven turbocharger.

The existing tri-turbocharged unit develops 376bhp at 4000rpm and 545lb ft at a relatively high (by diesel standards) 2000rpm. 

As well as being earmarked for the new M750d, the quad-turbocharged diesel is also set to appear in four-wheel-drive M Performance derivatives of the BMW X5 xDrive50d, BMW X6 xDrive50d, and X7 xDrive50d.

Get the latest car news, reviews and galleries from Autocar direct to your inbox every week. Enter your email address below:


Read our review

Car review

Technology-laden BMW 7 Series looks better than its predecessors, but is ultimately disappointing

Join the debate

Add a comment…
405line 8 March 2016

Lifetime Warranty please

I have been saying this for a while now...its all very well selling the public "Group B racers lite" however they ain't gonna have 6 mechanics servicing their car for free..are they.
Ski Kid 28 September 2015

Prefer a v8 4 litre with two turbos

I am sure a 4 litre v8 would be far more enjoyable .
jer 27 September 2015

I suppose

If one turbo goes end of life you need to replace all. So given a 150k life of a turbo its possible you'll have 5 year old cars written off because repairing the engine will be too expensive? Potentially a cottage industry will emerege converting them to twin turbos.