Just when it seemed every performance SUV was heading toward downsized engines and increasingly electrified futures, Mercedes-AMG has delivered a reminder that some traditions are worth fighting for.
Meet the heavily revised GLE 63 S 4MATIC+ and GLS 63 4MATIC+, two familiar high-performance SUVs that arrive carrying something increasingly rare in today’s automotive landscape: a hand-built AMG V8. More importantly, that V8 isn’t merely surviving—it has been extensively reengineered to ensure it remains part of AMG’s future.
At the center of both SUVs sits the latest evolution of AMG’s legendary M177 engine, a 4.0-liter twin-turbocharged V8 now known internally as the M177 EVO. While output remains unchanged at 612 horsepower and 627 pound-feet (850 Nm) of torque, AMG engineers have performed a comprehensive overhaul beneath the aluminum skin.
The headline change is a new flat-plane crankshaft, a feature more commonly associated with exotic sports cars than luxury SUVs weighing well over two tons. The switch reduces rotating mass, sharpens throttle response, and allows the engine to spin more freely toward redline. AMG says the result is a more eager and responsive character while simultaneously helping the powertrain meet increasingly stringent emissions regulations around the globe.
That balancing act—preserving personality while satisfying regulators—has become one of the industry’s greatest engineering challenges. AMG’s answer includes revised intake and exhaust ports, an updated fuel-injection system, redesigned turbocharger components, and a significantly upgraded emissions-control package that now includes a particulate filter as standard worldwide.
The V8 is no longer working alone, either.
A 48-volt electrical architecture and second-generation integrated starter-generator contribute an additional 23 horsepower and 151 pound-feet (205 Nm) of temporary assistance. The mild-hybrid setup smooths stop-start operation, improves low-end response, and recovers energy during deceleration without diluting the combustion engine’s character.
And yes, performance remains suitably outrageous.
Mercedes-AMG claims the GLE 63 S reaches 62 mph (100 km/h) in just 3.9 seconds, while the larger GLS 63 follows closely behind at 4.2 seconds. Both are capable of a 174-mph (280-km/h) top speed.
For many AMG loyalists, however, the numbers are only half the story.
The soundtrack matters just as much.
To that end, AMG has developed an entirely new Performance Exhaust system complete with active valves. In Comfort mode, the V8 settles into a subdued rumble appropriate for school runs and highway cruising. Select Sport+ and the system unleashes the deeper, more aggressive voice buyers expect from an AMG flagship.
Visually, Mercedes has given both SUVs a stronger performance identity. A redesigned front fascia features a more prominent Panamericana-style grille, larger cooling intakes, and new AMG-specific lighting signatures. Around back, quad exhaust outlets and an aggressive diffuser leave little doubt about what powers these machines.
The hardware beneath the bodywork receives equally significant attention.
AMG Ride Control+ combines air suspension with adaptive dampers and can alter its personality dramatically depending on driver preference. The system lowers the vehicle by 10 millimeters during spirited driving to improve aerodynamics and stability, yet can also raise ride height for rough roads or light off-road excursions.
For drivers who somehow find themselves tackling trails in a 612-hp luxury SUV, a dedicated Trail mode increases ground clearance by up to 55 millimeters while recalibrating the suspension, all-wheel-drive system, and damping characteristics.
Body control is managed by AMG Active Ride Control, which uses electromechanical anti-roll bars on both axles. Sensors monitor vehicle movements up to 1,000 times per second, actively counteracting body roll and helping these large SUVs corner with surprising composure.
The permanent AMG Performance 4MATIC+ system remains fully variable, capable of distributing torque precisely where it’s needed. Working alongside an electronically controlled rear differential, the setup promises sharper turn-in, improved traction, and greater stability whether carving through mountain roads or navigating snow-covered highways.
Inside, the formula blends performance and luxury in typical AMG fashion.
Drivers are greeted by the latest AMG Performance steering wheel, available in Nappa leather, microfiber-trimmed MICROCUT, or carbon-fiber finishes. Premium leather upholstery options span everything from understated black to vibrant MANUFAKTUR shades such as yacht blue and carmine red, while carbon trim and microfiber headliners reinforce the sporting atmosphere.
Technology also takes a step forward thanks to Mercedes-Benz’s new MB.OS operating system. High-resolution displays provide AMG-specific performance data, including real-time torque distribution, G-force measurements, and detailed engine telemetry, transforming the digital cockpit into a rolling performance command center.
Perhaps the most telling aspect of these updated SUVs isn’t any single specification, however. It’s the philosophy they represent.
In an era when performance increasingly arrives through batteries, software, and synthetic soundtracks, Mercedes-AMG has chosen to invest heavily in preserving one of its defining characteristics: a powerful twin-turbocharged V8.
The GLE 63 S and GLS 63 may be luxury family haulers on paper, but their existence sends a broader message. AMG believes there is still room in the future for eight cylinders, real exhaust notes, and the kind of mechanical drama that helped build the brand’s reputation in the first place.
For enthusiasts, that’s probably the most important number of all.
Source: Mercedes-Benz