BMW is already working on the next-generation 7 Series but that doesn’t mean the current one would be left untouched for the rest of its lifecycle. Still on sale in many regions around the world, Bavaria’s flagship saloon is getting a new family of straight-six diesel engines for the European market, which includes greener and more effective mills.

That’s possible thanks to the addition of a 48-volt electrical system with an integrated starter-generator, which helps acceleration with a boost of 11 bhp (8 kilowatts). BMW promises it’ll help the new 3.0-litre diesels deliver better fuel consumption of between 0.4 and 0.6 litres per 100 kilometres.

Starting with the 730d and 730d xDrive (and their respective long-wheelbase versions), these models get an updated inline-six diesel with an extra 21 bhp (15 kW) for a total output of 286 bhp (210 kW), while the torque goes up by 22 pound-feet (30 Newton-metres) to 479 lb-ft (650 Nm). Thanks to the added oomph, the two saloons gain an improved 0 to 62 miles per hour (0-100 kilometres per hour) acceleration in just 5.9 and 5.6 seconds, respectively.

Moving to the more powerful iteration of the 3.0-litre engine, the 740d xDrive now offers 340 bhp (250 kW), up 20 bhp (15 kW) compared to the previous version of the engine. Thanks to that, and the extra 15 lb-ft (20 Nm) to a peak of 516 lb-ft (700 Nm) between 1,750 and 2,250 rpm, the luxury saloon now needs just 5.0 seconds to reach 62 mph (100 kph) from a standstill, 0.2 seconds quicker than before.

Gallery: New inline-six diesel engines for BMW 7 Series

Both engines benefit from a new exhaust gas filtration system with an optimised diesel particulate filter, helping the diesel 7 Series meet Europe’s latest Euro 6d emissions standards. In addition, BMW says, customers will be offered with new customisation options for the exterior and interior, including the new BMW Individual Merino leather for the cabin in Smoky White/Midnight Blue/Black colour combo.