BMW has upgraded the power output of the straight-six diesel engine in the X7 (xDrive40d) from 335bhp to 347bhp. This enhancement is not aimed at making the SUV faster, but rather at reducing its fuel consumption. The additional 12bhp is obtained from a new mild-hybrid system, which includes a crankshaft-mounted starter-generator on the eight-speed automatic gearbox and a small battery to store the charge.

The X7, BMW’s largest vehicle, has undergone a mid-life facelift. Compared to its newer sibling, the XM, the X7 is more focused on refined luxury rather than aggressive sportiness. Despite its imposing presence and unique front light clusters, the X7’s design is still a matter of personal opinion. The M Sport specification is the most popular option, although the Excellence specification is also available.

Many people do not associate diesel engines with performance. However, the X7 xDrive40d is a powerhouse, capable of accelerating from 0 to 62mph in just 5.9 seconds. This impressive feat is achieved thanks to the incredible torque of 516lb ft, available from as low as 1750rpm. The X7 also offers more powerful engine options, including a turbo petrol straight six with 375bhp (xDrive40i) and a twin-turbo petrol V8 with 523bhp (M60i xDrive). Although the petrol engines deliver more power, they are less fuel efficient than the diesel option.

The X7’s diesel engine, known as the ‘B57’, is surprisingly quiet and smooth, making it difficult to believe it is a diesel. Its refined delivery and performance match the overall character of the vehicle, which is comfortable and laid-back. Even with the M Sport specification and 21-inch wheels, the X7’s ride is not compromised. The only downside is the noise from the run-flat tires on rough roads.

Despite its massive size, the X7 handles well due to its wide chassis. However, its limits are limited by its width rather than any concerns about stopping power, as it is equipped with large brake discs and strong calipers.