BY BMW'S own admission, it would have been "unwise" to radically change the styling of its top-selling luxury SUV and, for that reason alone, changes for the second-generation X5 run far more than skin-deep. Significantly stiffer and bigger in every direction - but hitting the scales at within 50kg of its predecessor - the new X5 gets a gruntier new alloy turbo-diesel (3.0d), a redesigned 4.8-litre V8 for the 4.8i and the latest magnesium-alloy Valvetronic petrol six in the entry-level 3.0si, which doesn't arrive until June. Combine that with the option of seven seats for the first time, brand-new suspension technology that makes it even better on-road and pricing that rises only for the low-volume V8 variant, and the new X5's appeal can only be wider.