The Mercedes-Benz GLS 450 (X167, facelift 2023) represents the latest iteration of Mercedes-Benz’s full-size luxury SUV. Introduced in September 2023, this model year signifies a significant refresh of the X167 generation, first launched in 2019. Positioned as a mid-range offering within the GLS lineup, the 450 variant balances performance, luxury, and efficiency, appealing to buyers seeking a spacious, technologically advanced SUV with a focus on comfort. It serves as a key competitor to vehicles like the BMW X7, Audi Q7, and Cadillac Escalade in the North American market.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLS |
| Generation | GLS (X167, facelift 2023) |
| Type | GLS 450 (381 Hp) Mild Hybrid 4MATIC 9G-TRONIC |
| Start of production | September, 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SUV |
| Seats | 7 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 10.2-11.7 l/100 km (23.1 – 20.1 US mpg, 27.7 – 24.1 UK mpg, 9.8 – 8.5 km/l) |
| CO2 emissions (WLTP) | 232-266 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.1 sec |
| Acceleration 0 – 62 mph | 6.1 sec |
| Acceleration 0 – 60 mph | 5.8 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 6.4 kg/Hp, 155.5 Hp/tonne |
| Weight-to-torque ratio | 4.9 kg/Nm, 204.1 Nm/tonne |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 20 Hp |
| Electric motor Torque | 200 Nm (147.51 lb.-ft.) |
| Electric motor location | Between the combustion engine and the transmission |
| Power | 381 Hp @ 5800-6100 rpm |
| Torque | 500 Nm @ 1800-5000 rpm (368.78 lb.-ft. @ 1800-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 256.830 |
| 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 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-scroll turbo, Intercooler |
| Valvetrain | DOHC, CAMTRONIC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 18.9 l (19.97 US qt | 16.63 UK qt) |
| Kerb Weight | 2450 kg (5401.33 lbs.) |
| Max. weight | 3220 kg (7098.88 lbs.) |
| Max load | 770 kg (1697.56 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) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 3500 kg (7716.18 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 140 kg (308.65 lbs.) |
| Length | 5209 mm (205.08 in.) |
| Width | 1956 mm (77.01 in.) |
| Width including mirrors | 2157 mm (84.92 in.) |
| Height | 1823-1928 mm (71.77 – 75.91 in.) |
| Wheelbase | 3135 mm (123.43 in.) |
| Front track | 1669 mm (65.71 in.) |
| Rear (Back) track | 1692 mm (66.61 in.) |
| Front overhang | 938 mm (36.93 in.) |
| Rear overhang | 1136 mm (44.72 in.) |
| Ride height (ground clearance) | 175-290 mm (6.89 – 11.42 in.) |
| Minimum turning circle (turning diameter) | 12.54 m (41.14 ft.) |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
INTRODUCTION
The GLS 450, as part of the X167 facelift, builds upon the foundation of its predecessor with updated styling, enhanced technology, and refined powertrain options. The X167 generation GLS aimed to provide a more luxurious and technologically advanced alternative to traditional large SUVs. The 2023 facelift brought subtle but impactful changes to the exterior design, interior appointments, and infotainment system. The 450 trim serves as a sweet spot in the lineup, offering a compelling blend of performance and fuel efficiency without the higher price tag of the GLS 580 or the performance focus of the AMG variants.
Powertrain & Engine Architecture
At the heart of the GLS 450 lies the M 256.830 3.0-liter inline-six cylinder engine. This engine utilizes a combination of direct injection and a twin-scroll turbocharger to deliver 381 horsepower and 500 Nm (368.78 lb-ft) of torque. Crucially, the GLS 450 incorporates a 48-volt mild hybrid system (MHEV). This system employs an integrated starter-generator (ISG) that allows for features like extended coasting, smoother start/stop operation, and a small power boost during acceleration. The engine’s CAMTRONIC valve lift adjustment system optimizes performance and efficiency by varying valve timing and lift based on driving conditions. The engine is paired with Mercedes-Benz’s 9G-TRONIC nine-speed automatic transmission, known for its smooth shifts and wide gear ratio spread. This transmission is specifically tuned to work in conjunction with the mild hybrid system for optimal efficiency.
Driving Characteristics
The GLS 450 offers a comfortable and refined driving experience. The 381 hp engine provides ample power for everyday driving and highway passing, with a 0-60 mph time of around 5.8 seconds. While not as overtly sporty as some competitors, the GLS 450 prioritizes a smooth and composed ride. The 9G-TRONIC transmission contributes to this by selecting gears seamlessly and maintaining the engine in its optimal power band. The mild hybrid system enhances responsiveness by filling in torque gaps during acceleration. Compared to the higher-output GLS 580, the 450 feels less urgent off the line, but offers a more balanced and fuel-efficient driving experience. The automatic transmission, while smooth, may not offer the same level of driver engagement as a manual transmission (which is not offered on this model).
Equipment & Trim Levels
The GLS 450 comes standard with a generous array of features, including Mercedes-Benz’s MBUX infotainment system with a large touchscreen display, a premium sound system, leather upholstery, heated and ventilated front seats, and a panoramic sunroof. Standard safety features include automatic emergency braking, lane keeping assist, and adaptive cruise control. Optional extras include a head-up display, massaging seats, rear-seat entertainment system, and a variety of interior trim options. The interior design emphasizes luxury and spaciousness, with high-quality materials and meticulous attention to detail. The standard interior upholstery is typically MB-Tex leatherette, with genuine leather available as an upgrade.
Chassis & Braking
The GLS 450 features a sophisticated suspension system designed to provide a comfortable ride and confident handling. The standard suspension utilizes air suspension with the ADS (Adaptive Damping System) which automatically adjusts damping characteristics based on road conditions and driving style. The GLS 450 is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features. The suspension is tuned to prioritize comfort, but still offers reasonable body control in corners. The GLS 450’s weight (2450 kg / 5401.33 lbs) is noticeable, but the powerful engine and well-tuned suspension help to mitigate its effects.
Market Reception & Comparison
The GLS 450 has been well-received by automotive critics, who praise its luxurious interior, comfortable ride, and advanced technology. Fuel economy is respectable for a vehicle of its size, with combined fuel consumption ranging from 10.2-11.7 l/100 km (23.1 – 20.1 US mpg). Compared to the GLS 580, the 450 offers a better balance of performance and fuel efficiency. The GLS 450’s mild hybrid system contributes to improved fuel economy and reduced emissions compared to non-hybrid versions. Reliability has been generally good, although some owners have reported minor issues with the infotainment system.
Legacy
The M 256 engine family, including the one found in the GLS 450, is expected to remain a mainstay in Mercedes-Benz’s lineup for the foreseeable future. The combination of inline-six cylinder configuration, turbocharging, and mild hybrid technology represents a significant step forward in terms of efficiency and performance. The X167 generation GLS, and specifically the 450 variant, is likely to hold its value well in the used car market due to its reputation for luxury, reliability, and advanced features. As technology continues to evolve, the GLS 450 will be remembered as a transitional model that bridged the gap between traditional luxury SUVs and the future of electrified mobility.
