The Mercedes-Benz GLS 600 V8 (558 Hp) EQ Boost 4MATIC G-TRONIC, produced from July 2020 to September 2023, represents the pinnacle of performance and luxury within the X167 GLS generation. Positioned as the flagship variant, it combined a potent twin-turbocharged V8 engine with a 48-volt mild hybrid system, offering a blend of substantial power and improved efficiency for the large, three-row SUV. This model catered to buyers seeking the ultimate in Mercedes-Benz SUV capability and refinement, competing directly with high-performance offerings from BMW and Land Rover.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLS |
| Generation | GLS (X167) |
| Type (Engine) | GLS 600 V8 (558 Hp) EQ Boost 4MATIC G-TRONIC |
| Start of production | July, 2020 |
| End of production | September, 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SUV |
| Seats | 4 |
| Doors | 5 |
| Fuel consumption (combined) | 11.7-12.0 l/100 km (20.1 – 19.6 US mpg) |
| CO2 emissions | 273-266 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 6d-TEMP-EVAP-ISC |
| Weight-to-power ratio | 5 kg/Hp |
| Weight-to-torque ratio | 3.8 kg/Nm |
| Gross battery capacity | 0.9 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 22 Hp |
| Electric motor Torque | 250 Nm (184.39 lb.-ft.) |
| Power | 558 Hp @ 6000-6500 rpm |
| Torque | 730 Nm @ 2500-5000 rpm (538.42 lb.-ft. @ 2500-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 176 |
| Engine displacement | 3982 cm3 (243 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 10.5:1 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-Turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Kerb Weight | 2785 kg (6139.87 lbs.) |
| Max. weight | 3250 kg (7165.02 lbs.) |
| Max load | 465 kg (1025.15 lbs.) |
| Trunk (boot) space – minimum | 520 l (18.36 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Length | 5205 mm (204.92 in.) |
| Width | 2030 mm (79.92 in.) |
| Height | 1838 mm (72.36 in.) |
| Wheelbase | 3135 mm (123.43 in.) |
| Front track | 1699 mm (66.89 in.) |
| Rear track | 1723 mm (67.83 in.) |
| Minimum turning circle | 12.52 m (41.08 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 9 |
| Gearbox type | Automatic transmission G-TRONIC |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Tires size (Front) | 285/45 R22 |
| Tires size (Rear) | 325/40 R22 |
Powertrain & Engine Architecture
At the heart of the GLS 600 V8 lies the M176 engine, a 4.0-liter twin-turbocharged V8. This engine utilizes direct fuel injection and a dual overhead camshaft (DOHC) valvetrain. The addition of the EQ Boost system, a 48-volt mild hybrid system, adds an electric motor producing 22 horsepower and 250 Nm (184 lb-ft) of torque. This electric motor is integrated between the engine and the transmission, providing assistance during acceleration and enabling a smoother start/stop function. The 9G-TRONIC automatic transmission, with nine forward gears, is standard, optimized for both performance and fuel efficiency. The engine’s longitudinal mounting and all-wheel-drive system (4MATIC) contribute to its dynamic handling characteristics.
Driving Characteristics
The GLS 600 V8 delivers impressive performance, achieving 0-60 mph in approximately 4.7 seconds. The EQ Boost system provides nearly instantaneous torque fill, minimizing turbo lag and enhancing responsiveness. While the 9G-TRONIC transmission offers smooth shifts, it is tuned more for comfort and refinement than outright sportiness. Compared to the GLS 450 or 580 models, the 600 offers a significantly more powerful and engaging driving experience. The added weight of the larger engine and hybrid components is noticeable, but the substantial power output more than compensates. The 4MATIC system provides excellent traction in various conditions.
Equipment & Trim Levels
The GLS 600 V8 came standard with a comprehensive suite of luxury features, including premium leather upholstery, multi-contour seats with massage function, a Burmester surround sound system, and a panoramic sunroof. Standard technology included the MBUX infotainment system with voice control, a digital instrument cluster, and a head-up display. Optional extras included rear-seat entertainment, upgraded leather options, and various driver-assistance systems. The interior design emphasized spaciousness and comfort, with high-quality materials throughout.
Chassis & Braking
The GLS 600 V8 features a double-wishbone front suspension and an independent multi-link rear suspension, providing a comfortable and controlled ride. Air suspension was standard, allowing for adjustable ride height and damping. Ventilated disc brakes are used on all four wheels, providing ample stopping power. The electronic stability program (ESP) and anti-lock braking system (ABS) are standard safety features. Due to the vehicle’s weight, the braking system is robustly engineered to ensure consistent performance even under demanding conditions.
Market Reception & Comparison
The GLS 600 V8 was generally well-received by automotive critics, praised for its powerful engine, luxurious interior, and comfortable ride. However, its high price tag and relatively low fuel economy were noted drawbacks. Compared to the GLS 580, the 600 offered a noticeable performance advantage, but at a significant cost premium. The GLS 600 also competed with the BMW X7 and Land Rover Range Rover, offering a similar blend of luxury and performance. Fuel economy figures of 11.7-12.0 l/100km (19.6-20.1 mpg) were typical for a vehicle of this size and performance.
Legacy
The M176 engine, while complex, has proven to be relatively reliable when properly maintained. The 9G-TRONIC transmission is also generally considered durable. However, the added complexity of the mild hybrid system introduces potential points of failure. On the used car market, the GLS 600 V8 commands a premium price due to its exclusivity and performance. Regular maintenance, including oil changes and inspections of the hybrid system, is crucial to ensure long-term reliability. The GLS 600 V8 represents a high point in Mercedes-Benz SUV engineering, offering a compelling combination of power, luxury, and technology.
