Highly desirable, but you'd have to be spectacularly uncaring about running costs to buy one

What is it?

The xDrive50i is now the fastest and most powerful of the mainstream (non-M division) BMW X5s, powered by the new 402bhp, twin-turbo 4.4-litre V8 also seen in the 5-series and 7-series.

Replacing the previous 350bhp naturally aspirated 4.8-litre V8, the twin-turbo unit is fitted as part of the latestround of upgrades for the X5 range, which also includes refreshed front and rear styling and more kit.

Linked to an eight-speed automatic gearbox, the new V8 not only brings a hefty increase in power and torque compared with its predecessor but also improved fuel economy and compliance with Euro5 emissions standards.

What’s it like?

It almost goes without saying that buying a thirsty twin-turbo petrol V8 SUV in the UK is foolhardy when the diesel versions are so outstanding in their own right and so much cheaper to run, but let’s just assume that nothing else will suffice. When viewed on its own merits, this new xDrive50i is quite magnificent.

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

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gaco1 20 July 2010

Re: BMW X5 xDrive50i SE

The BMW X5 remains the cream of the crop then. This 402bhp version is second in line to the X5M yet still out-paces any woolly Range Rover Supercharged.

Porsche with the Cayenne, Audi with the Q7 and Mercedes-Benz with the ML ensure that the Germans dominate the market.

Great article by the way; objective, informative and helpfully supplying a summary of the main figures at the end too. You should be promoted to Evo.

LOL your last sentence is funny-I know of at least one journo at Evo who is ridiculously biased. What's worse they pretend to be objective by masquerading their opinions with statements of fact.

moe360 16 July 2010

Re: BMW X5 xDrive50i SE

X5 is still one of the best bmw's out there cant find anything wrong with it, the only problem is the price

a51fff 16 July 2010

Re: BMW X5 xDrive50i SE

the 4.8i sounded fantastic, i hope the turbo'd v8 hasn't lost any of its 'burble'. petrol over diesel anyday. with diesel being more expensive by about 5p per litre, the saving isnt that great,considering in real world the petrol v8 x5 does 15mpg average and the diesel 24mpg, the diesel engine still has a long way to go in terms of refinement compared to a petrol.