A facelift in 2019 introduced three new engines to the GLC Coupe, a single 2.0-litre petrol and a 2.0-litre diesel with a couple of power outputs. We’ve so far only sampled the most powerful diesel; the 242bhp 300d, an engine that makes light work of the Coupe’s not inconsiderable heft. There’s plenty of muscle to be found low in the rev-range so you don’t have to work it particularly hard at all to make brisk progress, and flat-out acceleration is impressively strong. Still, the six-cylinder BMW X4 30d feels even more potent and is more refined.
But we suspect the petrol engines will be of more interest to UK buyers. The GLC 300 has 254bhp and matches the 300d for 0-62mph acceleration. However, on the road, there’s a more noticeable performance gap as the petrol needs working harder than the diesel, should you need some urgent acceleration.
At the top of the tree sits the bonkers fast GLC 63 Coupe with its 4.0-litre twin-turbo V8. Of course, if 469bhp isn’t enough, there’s the GLC 63 S Coupe, which gets 503bhp. For more information on that, have a look at our GLC 63 review.
Regardless of engine, you get a nine-speed automatic gearbox as standard. It changes gear smoothly and although there is a little hesitancy at low speeds, it’s still more responsive than the Range Rover Evoque’s ‘box.
Refinement never used to be a GLC Coupe strong point, however; now the gruff old 2.1-litre diesels have been chucked in a skip, it’s on par with the four-cylinder BMW X4s, if not quite so hushed as the Audi Q5. The 300 petrol is even better, sending fewer vibrations through the controls and proving less vocal, too. It even does a passable impression of a six-cylinder engine thanks to some trickery using the stereo speakers. However, the quieter engines do mean you notice the pronounced road roar even more these days.
The GLC Coupé gets the same variable steering set-up as the GLC, but it's been made slightly quicker to give a sportier feel. In truth, while it's fairly precise, it still feels unevenly weighted and uncommunicative. There's no doubt that a Porsche Macan better communicates what the front tyres are up to..
There are two suspension options: an adaptive system (which we’re yet to try) and the air suspension that’s fitted with top spec AMG Line Premium Plus Ultimate trim. In the latter spec, the GLC Coupé has a pleasingly wafty ride on the motorway, but the standard 20in wheels mean it picks up on expansion joints and crumbly roads more than we’d like, especially in an urban environment.
Selecting Sport mode stiffens the suspension and adds steering weight and gearbox sharpness, but this doesn't stop the GLC from leaning in corners and feeling every bit as weighty as it is. Ultimately, on a tight and twisting road, you’d have more fun in an X4 or Macan.