As well as being supremely refined, the twin-turbo V8 gives the X5 startling performance; 5.5sec to 62mph makes it one of the very quickest SUVs on sale, bettered only by the much more expensive Porsche Cayenne Turbo, Mercedes ML63 and BMW’s own X5/X6M. With a fat 443lb ft of torque from 1750rpm, the xDrive50i is as flexible as the best diesels but also wonderfully smooth and crisp. It sounds nice, too.
Although more efficient than its 4.8-litre predecessor, the new V8’s combined 22.6mpg and CO2 output of 292g/km don’t make great reading when the superb, equally torquey xDrive40d achieves 37.7mpg and 198g/km of CO2, but there’s some consolation in the fact that the V8 BMW is less profligate than other big petrol SUVs such as the Range Rover Sport Supercharged and Infiniti FX50S.
In SE spec the X5 has a relaxed and comfortable ride for a BMW, but its chassis struggles to match the xDrive50i’s searing performance, with a little too much roll and a lack of composure when pressed. If recent experience of the xDrive40d M Sport is any indication, the tighter body control that comes with the sports suspension is just about essential on a car as fast as the xDrive50i.
As with all X5s, the cabin is wonderfully cosseting and comfortable, with plenty of space front and rear and one of the best driving positions you’ll find anywhere.
Only next to the warmth and charisma of Land Rover’s more upmarket models does the X5 pale slightly, but for me this cabin is close to faultless.
Should I buy one?
For its performance and refinement, the xDrive50i is highly desirable, but you’d have to be rabidly anti-diesel or spectacularly uncaring about running costs to choose it over one of the two new oil-burning X5s.
An xDrive40d M Sport is the one we’d recommend – but that doesn’t stop us from secretly liking the hot-rod xDrive50i a lot.
BMW X5 xDrive50i SE
Price: £55,080; Top speed: 149mph; 0-62mph: 5.5sec; Economy: 22.6mpg; CO2: 292g/km; Kerb weight: 2190kg; Engine: V8, 4395cc, twin-turbo, petrol; Power: 402bhp at 5500rpm; Torque: 443lb ft at 1750-4500rpm; Gearbox: 8-spd automatic