If you don't find the coupe-SUV statement this X4 makes as extreme as that of its larger X6 stablemate, then we'd agree with you. It's been described as the X6's 'attack-dog little brother' and that probably sums it up. While the X6 holds two fingers up to the establishment, this car's approach is mellower and easier on the eye. If you want it to make more of a statement, then you're going to need to buy a car whose original owner resorted to the options list.
That said, you'd have to say that there's a cohesion to this car's shape and a purpose to its stance that escapes its bulky bigger sibling. The Munich brand thinks it has 'the sporting elegance of a classical coupe', though it's debateable whether any kind of SUV can ever manage that. Still, it's certainly a design that'll prove popular with those desiring a BMW of this sort but wanting something a bit less staid and suburban than an X3. Slinkier looks though, often lead to practical compromises and you can't help looking at the sweeping rear tail section and wondering about the compromises that might involve for the headroom of rear seat occupants.
In the event, there aren't really any to make, though only because BMW has positioned the back seat 28mm closer to the ground than it would be in an X3. It also helps that the ceiling has been gauged out to good effect and that there are reasonable standards of leg and knee room for this class of car. Up-front, the seats are also positioned in a lower, sportier demeanour than they would be in an X3, this time 20mm closer to the deck. Glance around and if you're at all familiar with the M2 version of BMW's more conventional X3 model, you won't find much difference here - which may be a slight disappointment after the avant garde exterior looks. But it all works so well, the main dials in particular a model of clarity. And out back? Well, once the standard automatic tailgate raises slowly open, you'll find that the swept-back styling has slightly reduced the carriage capacity of this car over what you'd get in an X3 - though not by too much, the figure reduced from 550-litres to 500-litres in this X4.
As usual, make sure that servicing has been correctly carried out at a BMW main dealer. Given this X4's 'crossover' rather than full-SUV status, it's unlikely than any given car will have been subjected to any off-road heroics, but check around the sills just in case. Kerbed alloy wheels and signs of interior child damage are much more likely. Use these as negotiating points with the seller.
Our ownership survey uncovered a number of satisfied customers, but also a number who'd had teething issues. One car exhibited a knocking noise from the front right, traced to a faulty steering rack. In fact, no fewer than four replacement racks were needed on that particular model; apparently, it's due to a design fault. On owner reported a buzzing sound from the back end of the car, while another talked of transfer case whine (a £2,000 fix) and yet another said he'd noticed occasional screeching from the engine. Look out for all these things on your test drive. Other failures related to the front door latch, the rear boot latch, the trip computer, the tow bar and the Bluetooth module; check all of these. One owner found his car's front brake discs needed prematurely replacing. Another reported a rattly sunroof and door seals that squeaked.
(approx based on a 2015 X4 20d xDrive 190bhp excl. VAT) A pair of brake pads are between £28-£35 for cheap brands and between £50 and £70 (or even as much as £93) if you want an expensive make. A pair of brake discs start in the £60 to £80 bracket, but you can pay in the £112 to £150 bracket for pricier brands. A drive belt is around £15. Air filters sit in the £22 bracket. Oil filters cost around £15. Fuel filters sit in the £27 to £22 bracket. A wiper blade sits in the £8 to £17 bracket. A headlight is about £360 and a mirror glass sits in the £25 to £28 bracket, but you can pay in the £42 to £44 bracket for pricier brands.
Given that BMW's X3 - the car this X4 is based upon - is arguably the sportiest offering in the premium-badged compact SUV segment, you might approach a drive in this model with quite high hopes, armed with the knowledge that it has a lower centre of gravity and springs that are about 15% stiffer. It'd be hard, you'd think, for the Munich men to mess this one up.
Nor have they. Point it down a fast, winding road and your smooth, flowing progress will be imperious, aided by xDrive all-wheel drive traction that inspires enormous confidence. It helps that feedback from the tactile, pleasantly chunky three-spoke sports steering wheel is far better than you fear an electric steering system might offer - though for us, it still lacks that last enth of tarmac feedback that as enthusiasts, we'd be really seeking. Under the bonnet, the mainstream X4 line-up is an all-diesel one that opens with a xDrive 20d variant packing a 190bhp 2.0-litre turbodiesel. Of course, for some a BMW is only worthy of the name if it features a proper straight-six plumbed in up-front. If that's the case, you'll start your search with the xDrive30d variant. This is fitted with the auto 'box as standard and delivers a pokey 258bhp that's an exact match for the directly comparable Porsche Macan S Diesel. In the unlikely event that this should prove to be a little tardy for you, there's always the xDrive35d which delivers 313bhp and uses Launch Control to batter its way to 62mph in 5.2s before keeping on accelerating all the way to 153mph.
Inevitably, a model of this kind will continually divide opinion. The people who don't like it will tell you to buy a cheaper, more practical X3 - but then they're probably the same people who can't see the point of anything prioritising style over substance. In any case, this X4 does have substance to its proposition - at least when it comes to efficiency, quality and low running costs. It's even reasonably spacious and practical.
Don't be dissuaded then, if you'd like one. This may not be quite the sharpest dynamic contender in its segment but it's still an astonishingly rewarding steer for something based on SUV underpinnings. Yes, there's an element of compromise in its packaging but the world would be a dull place if we only bought cars on a pragmatic basis. File this one under 'unexpectedly likeable'.