The big change for the new BMW X5 M SUV is that the V8 engine now has some mild-hybrid assistance. This doesn’t change the final output figures, but it does add 12 hp and 147 lb-ft at lower revs.

Around 350 units are destined for the U.S. The X5 is a luxurious, comfortable and quick luxury SUV. However, some of its active-safety systems can be too sensitive, and the optional gesture ...