View Photos of the 2027 Mercedes-AMG GLS63

Mercedes BenzPhotosMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzMercedes BenzPhotosAdvertisement - Continue Reading BelowAdvertisement - Continue Reading Below

The Mercedes-Benz GLS is the brand's largest SUV, charged with the dubious honor of being the S-Class of SUVs, and to keep up with the W223 S-Class's recent refresh that brought new styling, powertrains and tech, it's now the GLS's turn for its second facelift. You've been seeing a series of Mercedes SUV reviews hit the site over the past few weeks, starting with the also reworked 2027 Mercedes-Benz GLE, then the 2027 Mercedes-AMG GLE53, and now it's finally time for the big daddy Mercedes-AMG GLS63. I didn't get the chance to drive the non-AMG GLS on this trip, though its updates mirror those given to the smaller GLE. The GLS63 is really the one you want to hear about anyway, though. This, the pinnacle of the GLS lineup, is utterly ridiculous and totally pointless, yet simultaneously awesome.

At first glance, the new Mercedes-Benz GLS Class looks like a typical midcycle update: new lights, grille, wheel designs; a little nip and tuck to keep things fresh. However, some 3000 components are new or revised, more than 40 percent of the pieces that go into this 17-foot long, 6100-pound SUV. Consider the V-8 in the AMG GLS 63. It’s still a twin-turbocharged 4.0-liter making 603 hp and 627 lb-ft of torque, the same peak figures as last year. Nothing new there, right? Well, not much beyond the block, the heads, the turbos, the camshafts, and the hybrid system’s electric motor. Not only is the crankshaft new, it’s an entirely new concept—new, at least, to the GLS. Like decades’ worth of high-winding Ferrari V-8s and the LT6 in the range-topping C8 Corvettes, Mercedes’s M177 Evo uses a flat-plane crank. Mercedes BenzWhen they massaged the M177 V-8 for the last-generation AMG GT Black Series, Mercedes engineers were surprised to find it developed more torque more quickly with a flat-plane crankshaft than the cross-plane piece it was originally designed with.

Matt Nelson is an automotive journalist with nearly a decade of experience in all things cars.  He's spent years working at dealerships in sales, finance, and service. He's since traded in his pens and wrenches for a keyboard, and leveraged the expertise gained from his work experience into a writing career. When it comes to cars, facts, and the truth, Matt’s equal love for all three meant automotive journalism was the only path forward. Ever since the age of six, when he’d spend his time helping his father fix his family’s old Buick, Matt has had a keen interest in anything and everything with four wheels. Naturally, once Matt started working, he ensconced himself in the automotive industry and held positions spanning from car detailer, mechanic, to automotive sales and finance. Because he’s seen it all, driven most, and heard a lot, auto journalism came naturally to him. With a passion for cars like Matt’s, it’s safe to say every article will showcase his penchant for truth, accuracy, and overarching desire to make sense of the modern, complex automotive world. This means every one of his readers can be at the forefront of the most important automotive news.

Michal studies Automotive Journalism at Coventry University in the UK, and has been writing for CarBuzz since March 2025. He was nominated for student culture piece of the year recently and has been the Vavel.com F1 Editor. He studied Journalism at university to combine his love of writing and cars. Michal's love for cars started when he couldn't sleep as a baby. His father would watch the only thing on TV to help them relax - Formula 1. Since then, he's felt like he's had a V10 ringing in his mind.

On today’s numerically-infused episode of Quick Charge, we take a look at all the latest product and delivery delays from Tesla’s Q3 earnings call before changing lanes and recapping some of the biggest developments in the world of EV charging innovation. You read that right: after years of broken promises and delays unsupervised Full Self Driving remains at least six months away for what certainly feels like the ninth year in a row, while the humanoid Optimus robot does its best Ricky Bobby impression and Porsche, BMW, and Liebherr show up with some genuine innovations to speed up EV charging and eliminate range anxiety once and for all.