2026 Mercedes-AMG GLC 53 4Matic+ | UK Review

Can six cylinders and 449hp succeed where an electrified four-pot failed?

By Nic Cackett / Monday, 31 August 2026 / Loading comments

Given all the U-turning taking place in the industry right now, all those write-downs and half-baked EV strategies biting the dust, the decision to build hybridised, four-cylinder versions of what were previously big vee Mercedes-AMGs looks like relatively small potatoes. This is a fairly niche end of the market, after all. When entire model lines have been culled for lack of demand, the fate of several comparatively low-volume trim levels does not seem like life and death for a manufacturer of Mercedes size.

And yet. For anyone hoping to find a microcosm that succinctly describes the situation that carmakers find themselves in, you could do a lot worse than examining Mercedes' efforts to ride roughshod over the preferences of an otherwise enthusiastic customer base. Did AMG diehards want a four-cylinder engine strapped to a clever battery pack? Well, if there was any evidence of it in theory, it died upon contact with reality. The E Performance cars did not want for power or pace or even innovation. The problem was that they were fundamentally not what buyers wanted.

Of course, the upside of the problem being obvious to all and sundry is that it didn’t require a room full of rocket scientists to arrive at the solution. Where previously there were four cylinders and some very conspicuous e-motors in the GLC 63, there are now six with very mild hybrid assistance in the new GLC 53. The 449hp M256 unit is already familiar from its showing in the CLE (and elsewhere), though it’s been revised for the SUV with a redesigned head and intake system, alongside a new intercooler. This results in no more horsepower than before, but peak torque, temporarily accessible via overboost, has improved to 473lb ft in the ‘Evo’ version.

Meeting the GLC for the first time, the numbers are less immediately consequential than the ambience. This must’ve been high on the list of priorities during development because at no point does the 53 let you forget that there’s a six-pot back at the sharp end: it starts up with a bark, settles into a big-shouldered (presumably augmented) burr and will even locate something like a rasp when revved out. Perhaps you do not wallow in it like you would an AMG-built V8, but it’s a well-oiled sort of mechanical aura - one that you’ll appreciate if you experienced the four-pot buzzsaw that preceded it.

And as Matt discovered in Germany back in the spring, there’s little wrong with the performance being meted out either. Mercedes claims 4.2 seconds to 62mph, and that’s believable enough based on a snowballing sense of urgency once the straight six has found its stride. This doesn’t take long either: you barely acknowledge the assistance of the starter generator, but it’s there somewhere, helping to maximise the sense of flexibility and fluency which is ultimately the engine’s calling card.

In terms of succeeding where the 63 failed, this is important because the hybrid powertrain specialised in battery-powered surge, not smoothness. The 53 (by design, clearly) manages that turbocharged six-pot trick of seeming not just pleasingly responsive to subtle throttle inputs, but also becoming progressively more involving as you ask more of it. So while it doesn’t launch like the 63, the sense of connection with the engine, and the basic pleasure of interacting with it in gear, are far superior.

It also helps that the GLC has lost some weight with its flux capacitor now in the bin. The 53 weighs around 100kg less than the 63, which benefits not just the car’s straight line speed generally, but also the deftness of its handling specifically. (Admittedly, you can turn this up a notch beforehand by optioning the AMG Dynamic Plus package, which, among other things, adds active engine mounts and an electronically controlled rear diff.) Regardless, the 53’s overhauled chassis twins steel springs with dual-valve adaptive dampers, and there’s four-wheel steering to help what’s left of its 2.1-tonne mass get turned in.

Much like the powertrain, AMG is obviously keen for buyers to lean into the experience. The 53 abandons some of the low-speed cosset you might expect of an upmarket SUV, and replaces it with the sort of tenacious body control that (even in its default Comfort), makes it plain to the driver that things are going to be rosier at 60mph than 30mph. The trade-off around town, or on bomb-cratered minor roads, is readily apparent in the head toss that greets abrupt changes in camber, as well as the occasionally brittle secondary ride.

But assuming you’re as keen to push on as the straight six is, you can expect to appreciate the opposite end of the scale. The 53 is impressively well-damped, and while the technological veil pulled over its mass is hardly a clocking device, an abiding sense of fast-twitch burliness is massaged into the fast GLC dynamic like liniment into thigh muscle. The steering response is stout enough to chime with the spring rate, and the grip levels predictably mighty, making it very easy on a smooth-ish A road to find a well-mannered, Germanic sort of flow.

Perhaps it’s telling that no matter how confidently it changes direction, you rarely feel the impulse to upshift to the even more aggressive Sport mode - the 53 does not possess the nuance nor the shrink-wrap talent of something like the outgoing Porsche Macan GTS - but nor will you feel shortchanged on sporting intent. The go-faster GLC is plainly meant to seem leery and latently powerful in the finest AMG tradition, and generally speaking, it does. You dip into its potential sporadically and mostly for the pleasure of feeling it work the contact patches. Or your eardrums.

Granted, spend too much time pootling and you might start to reflect on the £79,250 starting price - or £89,250 for the version most people will buy - and the fact that something like a BMW X3 M50 (with 398hp and from £73,795) would be cheaper, more economical and probably slightly more comfortable. But the M50 is a have-your-cake-and-eat-it family SUV, of the sort BMW does very well. Clearly, the 53 is a more deliberate attempt - prompted by past mistakes - to elevate the GLC’s appeal above purely practical considerations. In other words, and insofar as Mercedes thinks it possible without finding its V8 shoehorn, the new flagship is about providing AMG fans with something they might actually like. U-turn accomplished.

SPECIFICATION | 2026 MERCEDES-AMG GLC 53 4MATIC+

Engine: 2,999cc turbo straight six, mild hybrid
Transmission: 9-speed automatic, all-wheel drive
Power (hp): 449@5,500rpm-6,100rpm
Torque (lb ft): 443@2,200rpm-5,000rpm (473 with overboost)
0-62mph: 4.2
Top speed: 155mph (168mph optional)
Weight: 2,137kg
MPG: 28.9-29.5
CO2: 220-225g/km
Price: £79,250 (AMG Premium spec; AMG Premium Plus for £89,250, Edition 53 for £92,250)