The rise of the coupé-inspired sports utility vehicle is in full force — and none more so than in the premium mid-sized class.
As a sign of just how competitive this class of crossovers has become, BMW has now launched a second-generation X4 just four years after the orginal model reached showrooms.
The decision, which was also forced in part by a need to link it with the model cycle strategy of the mechanically identical X3 to meet production line efficiencies, suddenly gives BMW the advantage of having the most contemporary offering in what has become a truly lucrative market segment.
Understanding the X4's mechanics
The model tested here, the £55,315 M40d M Performance, is the initial flagship of the new line-up. It is offered alongside the xDrive20d, xDrive30d and M40i M Performance in the UK.
Running the latest evolution of BMW’s twin-turbocharged 3.0-litre diesel engine, it serves up 326bhp at 4400rpm and 501lb ft of torque on a relatively narrow band of revs between 1750rpm and 2750rpm.
The longitudinally mounted in-line six-cylinder is mated to a standard eight-speed Tiptronic automatic gearbox and, like all new X4 models, a fully variable four-wheel drive system to provide the most potent of the new diesel X4 models with a claimed 0-62mph time of 4.9sec and limited 155mph top speed, in combination with claimed fuel consumption of 47.9mpg and average CO2 emissions of 173g/km on the NEDC cycle.
Performance is defined by the heady levels of torque concentrated in the bottom half of the rev range rather than top-end power. Despite its 1895kg kerb weight, both step off and in-gear acceleration are particularly strong, although it is the hushed constant throttle operation and effortless cruising qualities in taller gears at typical motorway speeds that impressed us most about the top-of-the-line X4 during our first drive in the US. The standard eight-speed automatic gearbox is also terrifically smooth and quick to engage — both on upshifts and downshifts.
The racy qualities of the M40d fully befit the positioning of the new X4, which has moved further upmarket in both looks and features, making way further down the range for the recently introduced X2.
Predictably, given the growth of the latest X3 on which is it based and assembled alongside at BMW’s Spartanburg factory in the US, the 2018 model is larger than before; length is up by 81mm to 4752mm, width has increased by 37mm to 1918mm, height is reduced by 3mm to 1621mm due to lower ground clearance and the wheelbase has been extended by 54mm to 2864mm.