Any engine that makes a two-tonne luxury conveyance like this capable of accelerating as quickly as a hot hatch, of soothing away miles with the manners of a first-class cabin attendant and of delivering more than 50mpg merits a warm reception from all quarters.
To be fair, the greatness of BMW’s 3.0-litre six-cylinder diesel is so well established that it’s almost beyond question. If any oil-burning engine deserves immunity from the toxic swell of public opinion against diesel, it’s this one.
Whether it will survive that swell or not will have little to do with what’s just, of course. But rest assured, this engine has the muscle and tractability to move a heavy car effortlessly, and its application in the 630d GT has more than enough suaveness and refinement to suit a car with such a luxury-targeted brief.
This engine’s 457lb ft of tractive urge and ZF’s excellent eight-speed automatic gearbox make relaxed ground-covering blissfully easy.
There’s a distant, faintly gravelly thrum audible from it at times, but even at high revs and under high loads, it’s no chore to listen to.