The cross-pollination of clunky 4x4 and Bavarian driving machine ought to have been as silly as mountaineering stilettos, but it turned out to be the answer to modern motoring: slyly involving when necessary, a quarantine of elevated solitude when not.
However, while profligacy and power were conspicuously at the heart of the X5, BMW failed to take it to its inevitable conclusion, leaving others – notably Mercedes-AMG and Porsche – to sweep in and build supercar-fast versions of their contemporary SUVs.
The results, equipped with the firm’s new twin-turbocharged 4.4-litre V8 motor, were among the quickest SUVs ever built. But they were unforgiving machines to live with and run, and were ultimately overshadowed by better-known rivals and less-compromised stablemates.
Now, with the latest F15 variant of the X5 a little over a year old, M division has returned with a second run at what it thinks a fast SUV should be.