The Mercedes-Benz GL-Class X166, specifically the AMG GL 63 variant with the 558 horsepower engine and 7G-TRONIC automatic transmission, represented the pinnacle of performance and luxury within the first generation GL (X166) lineup, produced from 2012 to 2015. Positioned as the flagship model, it offered a compelling combination of full-size SUV practicality, high-performance capability, and the prestige associated with the AMG brand. This model aimed to compete with high-performance SUVs from Porsche, BMW, and Land Rover, offering a unique blend of on-road performance and limited off-road capability.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GL |
| Generation | GL (X166) |
| Type | AMG GL 63 (558 Hp) 4MATIC G-TRONIC |
| Start of production | 2012 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7 |
| 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 | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 4.5 kg/Hp, 222.8 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 303.4 Nm/tonne |
| Power | 558 Hp @ 5250-5750 rpm |
| Power per litre | 102.2 Hp/l |
| Torque | 760 Nm @ 2000-5000 rpm (560.55 lb.-ft. @ 2000-5000 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 |
| Cylinder Bore | 98 mm (3.86 in.) |
| Piston Stroke | 90.5 mm (3.56 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Kerb Weight | 2505 kg (5522.58 lbs.) |
| Max. weight | 3250 kg (7165.02 lbs.) |
| Max load | 745 kg (1642.44 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) |
| Permitted trailer load with brakes (12%) | 3250 kg (7165.02 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 5141 mm (202.4 in.) |
| Width | 1982 mm (78.03 in.) |
| Width including mirrors | 2141 mm (84.29 in.) |
| Height | 1850 mm (72.83 in.) |
| Wheelbase | 3075 mm (121.06 in.) |
| Front track | 1677 mm (66.02 in.) |
| Rear (Back) track | 1696 mm (66.77 in.) |
| Front overhang | 890 mm (35.04 in.) |
| Rear overhang | 1176 mm (46.3 in.) |
| Minimum turning circle | 12.45 m (40.85 ft.) |
| Wading depth | 500 mm (19.69 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | automatic transmission AMG SPEEDSHIFT PLUS 7G-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 |
| Power steering | Electric Steering |
| Tires size | 295/40 R21 |
| Wheel rims size | 21 |
Powertrain & Engine Architecture
The heart of the AMG GL 63 is the M157.982 5.5-liter V8 engine. This engine utilizes direct fuel injection and is equipped with two turbochargers, along with an intercooler to manage intake air temperatures. The engine produces 558 horsepower at 5250-5750 rpm and a substantial 760 Nm (560.55 lb-ft) of torque available from 2000-5000 rpm. The engine features a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The engine oil capacity is 9.5 liters, and requires a specific oil formulation to ensure optimal performance and longevity.
Power is transmitted to all four wheels via Mercedes-Benz’s 7G-TRONIC automatic transmission, specifically tuned by AMG for faster shift times and more aggressive performance. This transmission features seven forward gears and allows for manual gear selection via steering wheel-mounted paddle shifters. The 4MATIC all-wheel-drive system provides enhanced traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The AMG GL 63 delivers a surprisingly agile driving experience for a vehicle of its size and weight. Acceleration from 0 to 60 mph takes approximately 4.7 seconds, and it’s electronically limited to a top speed of 155 mph. The 7G-TRONIC transmission provides quick and smooth gear changes, and the AMG tuning ensures that the engine always feels responsive. While not as nimble as smaller performance SUVs, the GL 63 offers a confident and planted feel on the road. The all-wheel-drive system contributes to excellent grip and stability, making it a capable performer in various driving conditions. The gear ratios are optimized for both acceleration and highway cruising, providing a balance between performance and efficiency.
Equipment & Trim Levels
The AMG GL 63 came standard with a comprehensive list of luxury and performance features. Interior appointments included premium leather upholstery, heated and ventilated front seats, a panoramic sunroof, and a high-end audio system. Standard technology features included a navigation system, a rearview camera, and parking sensors. Optional extras included a rear-seat entertainment system, upgraded leather options, and various driver-assistance features. The exterior styling was enhanced with AMG-specific body styling, including unique front and rear bumpers, side skirts, and a rear spoiler. 21-inch alloy wheels were standard.
Chassis & Braking
The GL 63 features a fully independent suspension system, with double wishbones at the front and a multi-link setup at the rear. The suspension is tuned for a balance between comfort and performance, providing a relatively smooth ride while maintaining good body control. Braking duties are handled by ventilated discs at all four corners, providing ample stopping power. The AMG GL 63 also incorporates an anti-lock braking system (ABS) and electronic stability control (ESC) to enhance safety.
Market Reception & Comparison
The AMG GL 63 was generally well-received by automotive critics, who praised its powerful engine, luxurious interior, and surprisingly agile handling. However, its high price tag and relatively poor fuel economy were often cited as drawbacks. Compared to other trims in the GL lineup, such as the GL 350 or GL 450, the AMG GL 63 offered significantly more performance and a more luxurious experience, but at a substantial premium. Against competitors like the Porsche Cayenne Turbo and BMW X5 M, the GL 63 offered a compelling combination of space, luxury, and performance, though some reviewers found the handling to be slightly less precise than its German rivals.
Legacy
The M157 engine, while powerful, has demonstrated some susceptibility to certain issues over time, including potential for camshaft wear and oil leaks. Regular maintenance and adherence to recommended service intervals are crucial for ensuring the long-term reliability of this powertrain. Today, the AMG GL 63 remains a desirable vehicle in the used car market, appealing to buyers who want a high-performance, full-size SUV with a luxurious interior and a prestigious badge. Its combination of power, space, and features continues to make it a compelling option for those seeking a unique and capable vehicle.
