STUPENDOUS mid-range power, stupendous fuel economy and car-like on-road handling mix with surprisingly capable off-road behavior to make the BMW X5 3.0d something of a giant among large SUVs. The latest version gains a reworked, even more powerful turbo-diesel as well as an effective new 4WD system to cement its place as the class benchmark. This is one soft-roader that is actually able to tackle rough terrain although, as you’d expect, there comes a time when a LandCruiser or Patrol will eventually assert its off-road superiority. But how good is the new engine? Really, it’s hard to see why anyone would want the six-cylinder petrol X5.