The Mercedes-Benz GLS 450 (X167), produced from June 2020 to September 2023, represents a significant iteration of Mercedes-Benz’s full-size luxury SUV. Positioned as a mid-range offering within the third generation (X167) GLS lineup, it bridges the gap between the entry-level GLS 450 and the high-performance GLS 580 and AMG variants. This model is characterized by its incorporation of mild hybrid technology (EQ Boost) and a sophisticated 4MATIC all-wheel-drive system, aiming to balance power, efficiency, and luxury. The X167 generation marked a substantial upgrade over its predecessor (X166), offering increased interior space, advanced technology, and improved driving dynamics.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLS |
| Generation | GLS (X167) |
| Type | GLS 450 (367 Hp) EQ Boost 4MATIC 9G-TRONIC |
| Start of production | June, 2020 |
| End of production | September, 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SUV |
| Seats | 7 |
| Doors | 5 |
| Fuel consumption (urban) | 11.5-12.2 l/100 km (20.5 – 19.3 US mpg) |
| Fuel consumption (extra urban) | 7.4-7.9 l/100 km (31.8 – 29.8 US mpg) |
| Fuel consumption (combined) | 9-9.4 l/100 km (26.1 – 25 US mpg) |
| CO2 emissions | 206-215 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.2 sec |
| Acceleration 0 – 60 mph | 5.9 sec |
| Maximum speed | 246 km/h (152.86 mph) |
| Emission standard | Euro 6D-ISC-FCM |
| Weight-to-power ratio | 6.5 kg/Hp |
| Weight-to-torque ratio | 4.8 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 | 367 Hp |
| Torque | 500 Nm (368.78 lb.-ft.) |
| Engine Model/Code | M 256.930 |
| Engine displacement | 2999 cm3 (183.01 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92.4 mm (3.64 in.) |
| Compression ratio | 10.5:1 |
| Fuel injection system | Direct injection |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant capacity | 18.9 l (19.97 US qt | 16.63 UK qt) |
| Kerb Weight | 2385 kg (5258.02 lbs.) |
| Max. weight | 3230 kg (7120.93 lbs.) |
| Max load | 845 kg (1862.91 lbs.) |
| Trunk (boot) space – minimum | 355 l (12.54 cu. ft.) |
| Trunk (boot) space – maximum | 2400 l (84.76 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Permitted trailer load with brakes (12%) | 3500 kg (7716.18 lbs.) |
| Length | 5207 mm (205 in.) |
| Width | 1956-2030 mm (77.01 – 79.92 in.) |
| Height | 1823-1838 mm (71.77 – 72.36 in.) |
| Wheelbase | 3135 mm (123.43 in.) |
| Front track | 1669 mm (65.71 in.) |
| Rear track | 1692 mm (66.61 in.) |
| Ride height (ground clearance) | 200-215 mm (7.87 – 8.46 in.) |
| Drag coefficient (Cd) | 0.33 |
| Minimum turning circle | 12.52 m (41.08 ft.) |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Number of gears | 9 |
| Gearbox type | Automatic (9G-TRONIC) |
Powertrain & Engine Architecture
The GLS 450 is powered by the M 256.930 3.0-liter inline-six cylinder engine. This engine utilizes direct injection and is augmented by a single twin-scroll turbocharger and an intercooler. A key feature is the integration of Mercedes-Benz’s EQ Boost 48-volt mild hybrid system. This system incorporates a 22 horsepower electric motor positioned between the engine and the transmission, providing supplemental power during acceleration and enabling a smoother start/stop function. The engine produces 367 horsepower and 500 Nm (368.78 lb.-ft.) of torque. The 9G-TRONIC nine-speed automatic transmission is standard, delivering power to all four wheels via the 4MATIC all-wheel-drive system. The 4MATIC system is typically biased towards the rear wheels for a more engaging driving experience.
Driving Characteristics
The GLS 450 offers a comfortable and refined driving experience. The EQ Boost system provides a noticeable boost during initial acceleration, contributing to a responsive feel. While not as overtly sporty as the higher-performance GLS models, the 450 delivers adequate power for everyday driving and highway cruising. The 9G-TRONIC transmission provides smooth and seamless gear changes, contributing to a relaxed driving experience. Compared to the GLS 580 with its V8 engine, the 450 offers less outright acceleration, but it compensates with improved fuel economy. The automatic transmission is tuned for comfort and efficiency, prioritizing smooth shifts over aggressive downshifts.
Equipment & Trim Levels
The GLS 450 came standard with a comprehensive suite of features, including Mercedes-Benz User Experience (MBUX) infotainment system with a large touchscreen display, leather upholstery, heated front seats, a panoramic sunroof, and a premium sound system. Optional extras included ventilated front seats, rear seat entertainment, a head-up display, and various driver-assistance systems such as adaptive cruise control and lane-keeping assist. Interior trim options ranged from wood veneers to aluminum accents, allowing for a degree of personalization. The standard interior color schemes were typically black, beige, and various shades of gray.
Chassis & Braking
The GLS 450 features a sophisticated suspension system designed to provide a comfortable ride while maintaining good handling characteristics. The suspension utilizes air springs and adaptive damping, allowing the ride height to be adjusted based on driving conditions. Front suspension consists of a double wishbone setup, while the rear utilizes an independent multi-link suspension. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard safety features.
Market Reception & Comparison
The GLS 450 was generally well-received by automotive critics, who praised its spacious interior, comfortable ride, and advanced technology. The EQ Boost system was noted as a positive addition, enhancing both performance and efficiency. Compared to the GLS 580, the 450 offered a more affordable entry point into the GLS lineup, making it appealing to a wider range of buyers. Fuel economy was considered competitive for a vehicle of its size and weight. Reliability reports have been generally positive, with few major issues reported.
Legacy
The Mercedes-Benz GLS 450 (X167) represents a well-rounded luxury SUV that successfully blends performance, comfort, and technology. The M 256 engine, coupled with the 9G-TRONIC transmission and 4MATIC system, has proven to be a reliable and capable powertrain. On the used car market, the X167 GLS 450 holds its value well, reflecting its desirability and reputation for quality. The integration of mild hybrid technology foreshadowed Mercedes-Benz’s broader commitment to electrification, making this model a significant step in the evolution of the GLS lineup.
