Who needs diesel torque when the future is electric?
It's been a while since we saw diesel-powered BMWs in the United States, with the previous-generation BMW 3 Series Wagon being the last model to offer an oil-burning powertrain back in 2018. But in Europe and other parts of the world, diesel is still a big thing. BMW, however, is taking steps to reduce reliance on diesel and will be discontinuing its most potent diesel powertrain available, the quad-turbo 3.0-liter inline-six B57S engine. To do this, the automaker has announced a series of Final Edition models for the BMW X5 and BMW X7 in their respective M50d trims.
The 3.0-liter straight-six motor debuted in 2016 on the BMW 7 Series, producing substantial outputs of 394 horsepower and a monumental 561 lb-ft of torque. Since then, it's found use in the 5 Series, X5, X6, and the X7. However, the engine has been shortlived. Despite its impressive performance - the X5 M50d could crack 62 mph in just 5.2 seconds from a standstill - the quad-turbo motor was highly complex and too expensive to keep updating in order to comply with ever-stricter legislation surrounding engine emissions. The final units will be produced in September this year.
The X5 and X7 M50d Final Edition models will be sold in select markets in Europe to commemorate the retirement of the engine. Each model will receive bolstered specification that includes 'Final Edition' door sills, BMW Laserlight headlamps, comfort seats, gesture control, semi-autonomous driving, and unique 'Crafted Clarity' trim inserts. Additional features that will come as standard include a head-up display and a Harman Kardon sound system.
BMW claims that "diesel engines remain a relevant part of the BMW Group's portfolio", but that it will rely on twin-turbo diesel engines in the future with twin-scroll turbos to reduce the overall complexity. These will be supplemented by mild-hybrid systems incorporating a 48-volt electrical system as seen in the facelifted BMW 5 Series.