Mercedes gls 63

Interior, Comfort, and Cargo

Three rows of seating and interior styling that’s slightly sportier versus the Benz-branded GLS-class sets the GLS63 apart from two-row SUV powerhouses such as the BMW X5 M and the Audi RS Q8. Like those competitors, the GLS63 is gorgeously appointed inside. Soft leather covers nearly every square inch of the cabin, and those areas that aren’t leather-wrapped are treated to genuine wood trim and tastefully applied chrome; buttons and knobs are rendered in a rich-looking metallic finish. Front-seat occupants can enjoy a massage while blasting down the Interstate, and passenger space is generous in the second row, which can also be equipped with heated seats and power sunshades. The third row of seats is tight for adults but perfectly suitable for children. Cargo space is the same as the standard GLS-class, which in our testing fit four carry-on suitcases behind its third row and 30 in total behind the front seats.

Michael Simari

Pricing and Which One to Buy

Although the GLS63’s starting price is deep into the six-figure realm, we’d still suggest a few options sure to please the whole family. For one thing, the Warmth and Comfort package is a nice bundle for those in northern climates, as it adds heated door panels, heated armrests, and a heated center console. We’d also suggest the Energizing package which includes the in-cabin fragrance diffuser and the Acoustic Comfort package, and also adds increased cabin insulation for a quieter interior. Mercedes-AMG also offers a host of standalone features that may catch your eye, including the bonkers 23-inch multi-spoke forged wheels that look just perfect when framed within the GLS63’s muscular wheel wells.


The performance-tuning geniuses at Mercedes-AMG have finally been let loose on the new GLS-class SUV, and from those solid bones they’ve created the 2021 GLS63. Powered by a fire-breathing 603-hp twin-turbo V-8, luxuriously appointed, and spacious it offers commodious accommodations for the family that wants to travel rapidly—really, really rapidly. Mercedes-AMG has thrown all the tech features it has at the GLS63, including dual 12.3-inch infotainment displays, an available semi-autonomous driving mode, and a 48-volt hybrid system to help the big SUV’s performance. What brand of performance is that? The kind that enables it to accelerate like a rocket, V-8 engine roaring. This beast is a heads-up competitor to other oversized hot-rods such as the BMW X7 M50i and the Range Rover SV Autobiography—and comes with a price tag to match.

Engine, Transmission, and Performance

Under the hood of the GLS63 is a twin-turbocharged 4.0-liter V-8 engine that makes a whopping 603 horsepower with the help of a 48-volt hybrid system. All-wheel drive is standard, as is a nine-speed automatic transmission and air suspension. We were blown away by the 2021 GLS63’s performance at our test track as it out-accelerated several hot sports cars we’ve tested recently, tearing off a blistering 3.6-second zero-to-60-mph run. For comparison, the old GLS63—which made a mere 577 horsepower—managed a none-too-shabby 4.3-second zero-to-60-mph run. As impressed as we were with the GLS’s acceleration, we can’t say the same for its driving dynamics. The ride is firm, especially on the optional 23-inch wheels, but that firmness doesn’t translate to a feeling of precision when cornering. The GLS’s body bobs across road undulations more than expected, though it still offers plenty of grip to have some fun with on a twisty road.

Michael Simari

Warranty and Maintenance Coverage

Mercedes-AMG’s standard warranty policies aren’t anything special. Furthermore, they offer zero complimentary scheduled maintenance, unlike BMW and Audi, which both offer such a perk.

  • Limited warranty covers 4 years or 50,000 miles
  • Powertrain warranty covers 4 years or 50,000 miles
  • No complimentary scheduled maintenance



2021 Mercedes-AMG GLS63

front-engine, all-wheel-drive, 7-passenger, 4-door wagon

$149,115 (base price: $133,095)

twin-turbocharged and intercooled DOHC 32-valve V-8, aluminum block and heads, direct fuel injectionDisplacement
243 in3, 3982 cm3Power
603 hp @ 6500 rpmTorque
627 lb-ft @ 2500 rpm

9-speed automatic

Suspension (F/R): control arms/multilink
Brakes (F/R): 15.7-inch vented, cross-drilled, grooved disc/14.5-inch vented, cross-drilled, grooved disc
Tires: Michelin Pilot Sport 4S, F: 285/40R-23 (111Y) M01 R: 325/35R-23 (115Y) M01

Wheelbase: 123.4 in
Length: 206.4 in
Width: 79.9 in
Height: 70.2 in
Cargo volume: 17 ft3
Curb weight: 5927 lb

Rollout, 1 ft: 0.3 sec
60 mph: 3.6 sec
100 mph: 8.9 sec
130 mph: 16.0 sec
150 mph: 24.1 sec
Rolling start, 5–60 mph: 4.8 sec
Top gear, 30–50 mph: 2.9 sec
Top gear, 50–70 mph: 3.1 sec
¼-mile: 12.0 sec @ 115 mph
Top speed (mfr’s claim): 174 mph
Braking, 70–0 mph: 153 ft
Roadholding, 300-ft-dia skidpad: 0.92 g

Observed: 15 mpg
75-mph highway driving: 22 mpg
Highway range: 520 miles

Combined/city/highway: 16/14/20 mpg

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