BMW has unveiled what is perhaps their most potent diesel sports sedan (and wagon) to date. Complementing the M340i is the first ever M340d and it packs a big slug of torque to go along with it. It was first mentioned back in October 2019 as part of the expanding M division range, and this is the first time the 3 Series will be getting a high-performance diesel version tuned by their in-house performance division.
The M340d gets its power from a 3.0-liter, twin-turbocharged inline-six diesel mill, which is the same one used in larger models such as the 540d, 740Ld, and 840d.
Prior to the M340d, BMW previously offered the 335d but their stats pale in comparison to the new model. From 308 PS and 630 Nm of torque in the 335d, the M340d raises that to 340 PS and a staggering 700 Nm of torque. It can even give an additional 11 PS thanks to its mild-hybrid system. That means the M340d is also the first M car to feature this sort of technology.
With stats like the, the M340d does the 0 to 100 km/h sprint in just 4.6 seconds. Meanwhile, the station wagon version (Touring in BMW speak) does the same task in 4.8 seconds. To ensure that it nails those times as consistently as possible, BMW fitted these performance diesel sedans with xDrive all-wheel drive as standard. The M340d cannot be paired with rear-wheel drive only. Transmission on the other hand is an uprated and upgraded version of their eight-speed Sport Steptronic automatic.
Despite figures like that, BMW has big claims for its fuel economy. According to them, these hot turbodiesels can do up to 18.8 kilometers per liter. The Touring version gets slightly less, but BMW says that it can still do 18.5 kilometers per liter.
As for its exterior, it gets the same treatment as its gas-powered counterpart. That means it has a unique grill, more aggressive-looking bumpers, and wheels specific to this variant. The only way to tell an M340d from an M340i is through the badge which owners even have the option of deleting. Other upgrades include re-engineered suspension, bigger brakes, and a limited slip differential.