The Mercedes-Benz GLE 450 2.5 (367 hp) EQ Boost 4MATIC, introduced in August 2023 as part of the C167 GLE Coupe facelift, represents a significant iteration of Mercedes-Benz’s mid-size luxury SUV coupe. Positioned as a mid-range offering within the GLE Coupe lineup, it bridges the gap between the entry-level GLE 350 and the performance-oriented AMG models. This variant focuses on blending performance with efficiency through the implementation of mild hybrid technology. It builds upon the foundation of the C167 platform (introduced in 2019), offering a refined driving experience and updated styling cues.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLE |
| Generation | GLE Coupe (C167, facelift 2023) |
| Type | GLE 450 2.5 (367 Hp) EQ Boost 4MATIC 9G-TRONIC |
| Start of production | August, 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe, SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (combined) | 9.1-9.5 l/100 km (25.8 – 24.8 US mpg) |
| CO2 emissions | 217-227 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.9 sec |
| Acceleration 0 – 60 mph | 5.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 6.2 kg/Hp |
| Weight-to-torque ratio | 4.6 kg/Nm |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Power | 367 Hp @ 6000 rpm |
| Torque | 500 Nm @ 2000-4000 rpm (368.78 lb.-ft. @ 2000-4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 256.925 |
| Engine displacement | 2498 cm3 (152.44 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 77 mm (3.03 in.) |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger and Electric Powered Compressor, Intercooler |
| Kerb Weight | 2293-2305 kg (5055.2 – 5081.66 lbs.) |
| Max. weight | 2850 kg (6283.17 lbs.) |
| Trunk space (minimum) | 655 l (23.13 cu. ft.) |
| Trunk space (maximum) | 1790 l (63.21 cu. ft.) |
| Fuel tank capacity | 85 l (22.45 US gal) |
| Length | 4941 mm (194.53 in.) |
| Width | 2018 mm (79.45 in.) |
| Height | 1716 mm (67.56 in.) |
| Wheelbase | 2935 mm (115.55 in.) |
| Gearbox | 9 gears, automatic transmission G-TRONIC |
Powertrain & Engine Architecture
At the heart of the GLE 450 2.5 lies the M 256.925 engine, a 2.5-liter inline-six cylinder gasoline engine. This engine is notable for its combination of a single turbocharger and an integrated electric auxiliary compressor. This setup effectively eliminates turbo lag, providing near-instantaneous power delivery. Direct fuel injection is employed for precise fuel metering and optimized combustion. The engine utilizes CAMTRONIC variable valve timing and lift adjustment on both intake and exhaust valves, further enhancing efficiency and performance. The “EQ Boost” system adds a 48-volt mild hybrid system, incorporating a belt-driven starter-generator. This system allows for functions like extended coasting with the engine off, regenerative braking, and a boost function that adds up to 21 horsepower and 184 lb-ft of torque to the powertrain. The engine is mated to Mercedes-Benz’s 9G-TRONIC nine-speed automatic transmission, known for its smooth shifts and wide gear ratio spread. The transmission is calibrated to work seamlessly with the EQ Boost system, optimizing for both fuel economy and responsiveness.
Driving Characteristics
The GLE 450 2.5 delivers a refined and capable driving experience. The combination of the turbocharged inline-six and the EQ Boost system results in strong acceleration, with a 0-60 mph time of around 5.6 seconds. The 9G-TRONIC transmission provides smooth and quick gear changes, contributing to a comfortable ride. Compared to the base GLE 350, the 450 offers a noticeable increase in power and responsiveness. While not as overtly sporty as the AMG-tuned models, the GLE 450 provides ample power for everyday driving and confident highway passing. The mild hybrid system contributes to improved fuel economy compared to non-hybrid alternatives, although the coupe body style does impact aerodynamics slightly. The steering is precise and well-weighted, providing a connected feel to the road.
Equipment & Trim Levels
The GLE 450 2.5 typically comes well-equipped as standard. Interior features generally include MB-Tex or leather upholstery, power-adjustable front seats with memory function, dual 12.3-inch digital displays (instrument cluster and infotainment screen), and a premium sound system. Standard safety features include automatic emergency braking, lane keeping assist, and adaptive cruise control. Optional extras often include air suspension, multi-contour seats with massage function, a panoramic sunroof, and augmented reality navigation. Trim levels can vary by market, but generally offer packages that bundle popular options together. The interior design emphasizes luxury and technology, with high-quality materials and a modern aesthetic.
Chassis & Braking
The GLE 450 2.5 features a double-wishbone front suspension and an independent multi-link rear suspension. Air suspension is often included, providing a comfortable ride and the ability to adjust ride height. The suspension is tuned to balance comfort and handling, offering a stable and controlled driving experience. Braking duties are handled by ventilated discs on all four wheels. ABS (Anti-lock Braking System) and electronic stability control are standard features. The 4MATIC all-wheel-drive system provides excellent traction in various weather conditions. The system is typically rear-biased, enhancing driving dynamics.
Market Reception & Comparison
The GLE 450 2.5 has been generally well-received by automotive critics. Reviewers praise its refined powertrain, comfortable ride, and luxurious interior. The EQ Boost system is seen as a positive addition, improving both performance and fuel economy. Compared to the GLE 350, the 450 offers a significant performance upgrade. Compared to the higher-performance AMG models, the 450 provides a more balanced blend of performance and comfort. Fuel economy figures are competitive within the luxury SUV coupe segment. Reliability reports suggest that the M 256 engine is generally reliable, although long-term data is still being collected.
Legacy
The Mercedes-Benz GLE 450 2.5 EQ Boost 4MATIC represents a step towards greater electrification and efficiency in the luxury SUV segment. The M 256 engine, with its integrated electric compressor and 48-volt mild hybrid system, showcases Mercedes-Benz’s commitment to innovative powertrain technology. As a relatively new model, its long-term reliability is still being assessed. However, the robust construction and advanced engineering suggest that it will hold up well over time. On the used car market, the GLE 450 2.5 is expected to be a desirable option for buyers seeking a luxurious, capable, and relatively fuel-efficient SUV coupe.
