What is it?
Until recently, Mercedes' GLC was available with a host of exotic trim inlays, colours, leathers and perfumes (yes, really). However, it wasn't possible to add a fifth and sixth cylinder to your diesel engine - it was the four-cylinder 220 d, pokier 250 d or, well, nothing. That's no longer the case, because with news that a full-fat AMG GLC 63 is on the way to join the lesser GLC 43, there's also the option of Merc's venerable V6 350 d.
Happily, you may pair your V6 diesel with each and any of the GLC’s trims, which means prices for the 350 d start at £42,140 for the SE model and top out at £45,630 for the range-topping AMG Line we’re driving here. That's around £6000 more than the equivalent 220 d, and £4500 more than the 250 d. Of course, ours being a press demonstrator, the as-tested price climbs to a whopping £53,570, the most notable addition being Merc’s air suspension (a £1495 option).
Shelling out for the V6 brings 257bhp and a healthy 457lb ft. Considering the price premium, those outputs are a distinguished but required step up from the brace of four-cylinders beneath the V6 in the model range. Naturally, economy takes a hit, forcing official average fuel consumption down to 47.9mpg and CO2 emissions up to 159g/km. Not particularly good news for a private buyer, then, nor the company driver sitting across from the bean-counter pitching his or her case for a six-cylinder car.