What is it?
A slightly faster, more economical and further refined version of one of the UK’s best-selling executive class estates – the BMW 520d Touring.
Having undergone a mid-life facelift last year with a number of mild exterior and interior styling tweaks, Munich’s popular mid-range model has now received a new four-cylinder diesel engine in a move that further enhances its standing against rivals including the newly facelifted Audi A6 2.0 TDI, Jaguar XF 2.2D and Mercedes-Benz E220 Bluetec.
The B48-designated unit is the same longitudinally mounted 2.0-litre common rail unit unveiled in the facelifted X3 xDrive20d back in April. In the 520d, it delivers 187bhp at 4000rpm and 295lb ft of torque on a band of revs between 1750 and 2500rpm.
This gives it a slight 6bhp and 15lb ft increase over the old N47 engine, with which the 520d’s new engine shares its 90.0mm bore and 84.0mm stroke measurements. Despite the apparent similarities, though, BMW claims the B48 is new from the ground up.
Key among its developments is a new Bosch injection system. It operates at a higher pressure than previous incarnations, reaching peak values of up to 2000bar or some 200bar higher than before. It also receives injector nozzles with seven holes for improved combustion properties.