The Mercedes-Benz CLS 450 4MATIC, part of the C257 facelift generation produced from 2021 to 2023, represents a blend of luxury, performance, and efficiency within the four-door coupe segment. Positioned as a mid-to-high range offering within the CLS lineup, it introduced mild-hybrid technology to enhance fuel economy and responsiveness. This variant aimed to appeal to buyers seeking a sophisticated grand tourer with all-weather capability, combining the elegant styling of the CLS with a potent powertrain and advanced technology.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS coupe (C257, facelift 2021) |
| Type | CLS 450 (367 Hp) Mild Hybrid 4MATIC 9G-TRONIC |
| Start of production | 2021 |
| End of production | 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 11-11.6 l/100 km (21.4 – 20.3 US mpg) |
| Fuel consumption (extra urban) | 6.3-6.8 l/100 km (37.3 – 34.6 US mpg) |
| Fuel consumption (combined) | 8.1-8.5 l/100 km (29 – 27.7 US mpg) |
| CO2 emissions | 185-195 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.8 sec |
| Acceleration 0 – 62 mph | 4.8 sec |
| Acceleration 0 – 60 mph | 4.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6D-ISC-FCM |
| Weight-to-power ratio | 5.1 kg/Hp |
| Weight-to-torque ratio | 3.7 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 | 220 Nm (162.26 lb.-ft.) |
| Power | 367 Hp |
| Torque | 500 Nm (368.78 lb.-ft.) |
| 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 |
| Kerb Weight | 1865 kg (4111.62 lbs.) |
| Max. weight | 2560 kg (5643.83 lbs.) |
| Trunk (boot) space | 490 l (17.3 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal) |
| Number of gears | 9 |
| Gearbox type | Automatic (9G-TRONIC) |
| Front tires | 245/45 R18; 245/40 R19; 245/35 R20 |
| Rear tires | 275/40 R18; 275/35 R19; 275/30 R20 |
| Length | 4988 mm (196.38 in.) |
| Width | 1890 mm (74.41 in.) |
| Height | 1435 mm (56.5 in.) |
Powertrain & Engine Architecture
The CLS 450 4MATIC is powered by the M 256.930 3.0-liter inline-six cylinder engine. This engine utilizes a single turbocharger and direct fuel injection, producing 367 horsepower and 500 Nm (368.78 lb-ft) of torque. Crucially, this engine incorporates a 48-volt mild-hybrid system. This system features an integrated starter-generator (ISG) that allows for functions like extended coasting, smoother start/stop operation, and a small power boost during acceleration. The ISG recovers energy during deceleration, storing it in a 0.9 kWh lithium-ion battery. The engine’s architecture is longitudinally mounted, driving all four wheels through Mercedes-Benz’s 9G-TRONIC nine-speed automatic transmission.
Driving Characteristics
The combination of the inline-six engine, mild-hybrid system, and 9G-TRONIC transmission delivers a refined and responsive driving experience. The 4.8-second 0-60 mph acceleration time is respectable for a large, luxury coupe. The 9G-TRONIC transmission offers smooth and quick shifts, and the mild-hybrid system helps to fill in any turbo lag, providing a more linear power delivery. Compared to earlier CLS models with V6 or V8 engines, the 450 offers a more fuel-efficient option without sacrificing a significant amount of performance. While not as overtly sporty as some competitors, the CLS 450 prioritizes comfort and effortless cruising.
Equipment & Trim Levels
The CLS 450 4MATIC came standard with a comprehensive suite of features, including Mercedes-Benz’s MBUX infotainment system with a large touchscreen display, leather upholstery, heated front seats, a panoramic sunroof, and a premium sound system. Available options included augmented reality navigation, a head-up display, massaging seats, and various interior trim packages. The exterior styling featured a distinctive coupe silhouette with a diamond-block grille and LED headlights. Trim levels were largely defined by optional packages, allowing buyers to customize their vehicle to their preferences.
Chassis & Braking
The CLS 450 4MATIC utilizes an independent multi-link suspension at both the front and rear axles, providing a comfortable ride and good handling characteristics. The 4MATIC all-wheel-drive system provides excellent traction in all weather conditions. Braking duties are handled by ventilated discs on all four wheels, and the car is equipped with ABS, electronic stability control, and other advanced safety systems. The steering is electrically assisted, offering precise and responsive control.
Market Reception & Comparison
The CLS 450 4MATIC was generally well-received by automotive critics. It was praised for its luxurious interior, comfortable ride, and refined powertrain. The mild-hybrid system was seen as a positive step towards improving fuel efficiency. Compared to other four-door coupes in its class, such as the Audi A7 and BMW 8 Series Gran Coupe, the CLS 450 offered a compelling combination of style, comfort, and technology. Fuel economy figures were competitive, and the mild-hybrid system helped to reduce emissions. Reliability reports have been generally positive, with few major issues reported.
Legacy
The CLS 450 4MATIC represents an important step in Mercedes-Benz’s transition towards electrified powertrains. The introduction of the 48-volt mild-hybrid system paved the way for more advanced hybrid and electric vehicles in the Mercedes-Benz lineup. On the used car market, the C257 CLS 450 4MATIC holds its value well, thanks to its desirable features, strong performance, and reputation for reliability. The M 256 engine is considered a robust and well-engineered unit, and the 9G-TRONIC transmission is known for its smoothness and efficiency. As a result, these vehicles continue to be sought after by buyers looking for a luxurious and capable grand tourer.
