One new X6 feature of which BMW is rather proud is a simple pair of neatly trimmed kneepads.They flank the centre console to provide supportive leg-bracing when the cornering forces get large.
And they’re not misplaced, because the grip and composure of this M50d, which has firmed suspension, broad 19-inch rims and an optional roll-control system, are deeply impressive. Especially when you remember that this gargantuan five-door coupé weighs decisively over two tonnes.
It takes some serious commitment to generate the understeer that eventually arrives, and as a session on a test track reveals, planting the accelerator at this point actually has the car tightening its line as more power is fed to the front axle and it hauls itself around.
In truth you need a circuit to find this out, although it’s a characteristic that’s also useful on snow, say BMW’s development drivers. Torque-vectoring across the rear axle also heightens this X6’s impressive agility, as well as an all-wheel drive system that apportions 60 per cent of the engine’s effort to the rear wheels unless otherwise required.
A shame that the steering is almost bereft of feel despite the massive forces that must sometimes bear on its mechanism; better news is that it’s precise and solidly weighted.
The M50d is the most powerful of the diesels, this 3.0-litre, triple turbo straight-six producing 381bhp and an industrial grade 546lb ft, the full force of which is frequently available thanks to the eight speed transmission. Which can also have you loping along at 80mph on little more than 1800rpm, or shift with an enthusiastic flourish in sport.
At speed, the X6’s most remarkable feature is its near-monastic quiet, the diesel so sufficiently subdued that you hear only the gentle swish of air past the door pillars.
That’s on smooth-surfaced US roads at least, which generate little road roar and rarely betray a ride that will probably prove choppy in Britain, despite the fitment of self-levelling air springs to the M50d’s back axle.
Work the engine harder and it produces engagingly civilised sounds and superb shifts, although enthusiasts will prefer the mellifluous V8 beat of the xDrive50i.
Despite its coupé-like silhouette and performance orientation the X6 is far from impractical, especially now that it will seat five. Rear room is good, including headspace, although shoeroom is restricted by the bulky front seats.
Few will fail to enjoy the rich ambience of its finely furnished and elegantly sculpted interior, however, which is pleasure to sit in and satisfyingly well crafted.