The Mercedes-Benz GLS 63 AMG (X166) represents the high-performance variant of the first-generation GLS full-size SUV, produced from 2015 to 2019. Positioned as the flagship model within the X166 GLS range, it offered a potent combination of luxury, space, and exhilarating performance, appealing to buyers seeking a powerful and prestigious SUV. The GLS 63 AMG aimed to compete with high-performance SUVs from Porsche, BMW, and Land Rover, offering a uniquely Mercedes-Benz experience in a large package.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLS |
| Generation | GLS (X166) |
| Type | AMG GLS 63 (585 Hp) 4MATIC G-TRONIC |
| Start of production | 2015 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 15.8 l/100 km (14.9 US mpg, 17.9 UK mpg, 6.3 km/l) |
| Fuel consumption (extra urban) | 10.3 l/100 km (22.8 US mpg, 27.4 UK mpg, 9.7 km/l) |
| Fuel consumption (combined) | 12.3 l/100 km (19.1 US mpg, 23 UK mpg, 8.1 km/l) |
| CO2 emissions | 288 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.6 sec |
| Acceleration 0 – 62 mph | 4.6 sec |
| Acceleration 0 – 60 mph | 4.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 4.3 kg/Hp, 233.5 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 303.4 Nm/tonne |
| Power | 585 Hp @ 5500 rpm |
| Power per litre | 107.1 Hp/l |
| Torque | 760 Nm @ 1750-5250 rpm (560.55 lb.-ft. @ 1750-5250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 157.982 |
| Engine displacement | 5461 cm3 (333.25 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Compression ratio | 10:1 |
| Fuel injection system | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Engine oil capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Kerb Weight | 2505 kg (5522.58 lbs.) |
| Max. weight | 3290 kg (7253.21 lbs.) |
| Max load | 785 kg (1730.63 lbs.) |
| Trunk (boot) space – minimum | 680 l (24.01 cu. ft.) |
| Trunk (boot) space – maximum | 2300 l (81.22 cu. ft.) |
| Fuel tank capacity | 100 l (26.42 US gal | 22 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 3290 kg (7253.21 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 5130 mm (201.97 in.) |
| Width | 1934 mm (76.14 in.) |
| Width including mirrors | 2141 mm (84.29 in.) |
| Height | 1850 mm (72.83 in.) |
| Wheelbase | 3075 mm (121.06 in.) |
| Front track | 1655 mm (65.16 in.) |
| Rear (Back) track | 1675 mm (65.94 in.) |
| Minimum turning circle | 12.40 m (40.68 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 7 |
| Gearbox type | automatic transmission G-TRONIC |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 295/40 ZR 21 |
| Wheel rims size | 21 |
Powertrain & Engine Architecture
The heart of the GLS 63 AMG is the M157 5.5-liter V8 engine, a twin-turbocharged masterpiece. This engine, designated M 157.982 in this application, produces 585 horsepower at 5500 rpm and a substantial 760 Nm (560 lb-ft) of torque available from a low 1750 rpm all the way to 5250 rpm. The engine utilizes direct fuel injection and features an aluminum engine block and cylinder heads. The twin turbochargers, positioned within the V of the engine, provide near-instantaneous boost, minimizing turbo lag. The engine is longitudinally mounted at the front of the vehicle.
Power is transmitted to all four wheels via Mercedes-Benz’s 7G-TRONIC seven-speed automatic transmission. This transmission is specifically tuned for the AMG model, offering quicker shift times and a more responsive feel. The 4MATIC all-wheel-drive system is also AMG-enhanced, with a rear-biased torque distribution for a more dynamic driving experience.
Driving Characteristics
The GLS 63 AMG delivers a driving experience that belies its size and weight. Acceleration is remarkably swift, with a 0-60 mph time of around 4.4 seconds. The twin-turbo V8 provides a relentless surge of power across the rev range, making overtaking effortless. The AMG-tuned suspension, while providing a comfortable ride, minimizes body roll during cornering. The 7G-TRONIC transmission shifts smoothly and decisively, contributing to the overall sense of performance. Compared to the standard GLS models, the 63 AMG offers a significantly more engaging and sporty driving experience, though it comes at the cost of fuel economy.
Equipment & Trim Levels
The GLS 63 AMG came standard with a comprehensive array of luxury and performance features. Interior appointments included premium leather upholstery, AMG sport seats, and brushed aluminum trim. Standard technology included Mercedes-Benz’s COMAND infotainment system with navigation, a premium sound system, and a suite of driver-assistance features such as adaptive cruise control, lane-keeping assist, and blind-spot monitoring. Optional extras included a panoramic sunroof, rear-seat entertainment system, and various customization options for interior trim and exterior styling.
Chassis & Braking
The GLS 63 AMG features a fully independent suspension system, with double wishbones at the front and a multi-link setup at the rear. The suspension is specifically tuned by AMG for enhanced handling and ride comfort. Large ventilated disc brakes are fitted to all four wheels, providing ample stopping power. The AMG braking system often included upgraded calipers and rotors for improved fade resistance during spirited driving. The vehicle’s electronic stability program (ESP) is also AMG-tuned, allowing for a greater degree of driver control while maintaining safety.
Market Reception & Comparison
The GLS 63 AMG was generally well-received by automotive critics, who praised its powerful engine, luxurious interior, and surprisingly agile handling for a vehicle of its size. However, some critics noted the high price tag and relatively poor fuel economy. Compared to other trims in the GLS lineup, the 63 AMG represented a significant performance upgrade, but also a substantial price increase. It competed directly with the Porsche Cayenne Turbo, BMW X5 M, and Range Rover Sport SVR, offering a unique blend of German engineering and AMG performance.
Legacy
The X166 GLS 63 AMG remains a desirable vehicle in the used car market. The M157 engine, while known for its power, requires diligent maintenance, particularly regarding oil changes and cooling system upkeep. The 7G-TRONIC transmission is generally reliable, but may require servicing at higher mileages. Overall, the GLS 63 AMG offers a compelling combination of performance, luxury, and space, making it a popular choice for buyers seeking a high-performance full-size SUV. Its robust build quality and powerful engine ensure it will continue to be a sought-after vehicle for years to come.
