The Mercedes-Benz CLS 53 AMG, produced from 2018 to 2021 as part of the C257 CLS generation, represents a compelling blend of performance, luxury, and mild-hybrid technology. Positioned as a mid-range performance variant within the CLS lineup – sitting below the full AMG 63 S model – the CLS 53 aimed to deliver a more refined and efficient driving experience without sacrificing significant power. It distinguished itself through its innovative EQ Boost system, a 48-volt mild-hybrid architecture that supplemented the potent inline-six engine. This model played a key role in showcasing Mercedes-Benz’s commitment to electrified performance and offered a unique alternative to traditional high-performance coupes.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLS |
| Generation | CLS coupe (C257) |
| Type | AMG CLS 53 (435 Hp) EQ Boost 4MATIC+ TCT |
| Start of production | 2018 |
| End of production | 2021 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption at Low speed (WLTP) | 9.1 l/100 km (25.8 US mpg) |
| Fuel consumption at very high speed (WLTP) | 9.4 l/100 km (25 US mpg) |
| CO2 emissions (WLTP) | 206-214 g/km |
| Fuel consumption (economy) – urban | 11.4-11.5 l/100 km (20.6 – 20.5 US mpg) |
| Fuel consumption (economy) – extra urban | 7.1-7.3 l/100 km (33.1 – 32.2 US mpg) |
| Fuel consumption (economy) – combined | 8.7-8.8 l/100 km (27 – 26.7 US mpg) |
| CO2 emissions | 199-202 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.5 sec |
| Acceleration 0 – 62 mph | 4.5 sec |
| Acceleration 0 – 60 mph | 4.3 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d-TEMP |
| Weight-to-power ratio | 4.6 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 | 435 Hp @ 6100 rpm |
| Torque | 520 Nm @ 1800-5800 rpm (383.53 lb.-ft. @ 1800-5800 rpm) |
| Engine layout | Front, Longitudinal |
| 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 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger and Electric Powered Compressor, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant | 14 l (14.79 US qt | 12.32 UK qt) |
| Kerb Weight | 1980 kg (4365.15 lbs.) |
| Max. weight | 2550 kg (5621.79 lbs.) |
| Max load | 570 kg (1256.63 lbs.) |
| Trunk (boot) space – minimum | 490 l (17.3 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Length | 5001 mm (196.89 in.) |
| Width | 1890 mm (74.41 in.) |
| Width including mirrors | 2072 mm (81.57 in.) |
| Height | 1422 mm (55.98 in.) |
| Wheelbase | 2939 mm (115.71 in.) |
| Front track | 1647 mm (64.84 in.) |
| Rear (Back) track | 1637 mm (64.45 in.) |
| Front overhang | 893 mm (35.16 in.) |
| Rear overhang | 1169 mm (46.02 in.) |
| Ride height (ground clearance) | 120 mm (4.72 in.) |
| Minimum turning circle (turning diameter) | 12.3 m (40.35 ft.) |
| Drivetrain Architecture | ICE and electric motor drive rear wheels, with on-demand front wheel drive |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 9 gears, automatic transmission TCT AMG SPEEDSHIFT |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
Powertrain & Engine Architecture
At the heart of the CLS 53 AMG lies the M 256 3.0-liter inline-six engine. This engine is a marvel of modern engineering, featuring a sophisticated combination of technologies including direct injection, a twin-scroll turbocharger, and an integrated electric auxiliary compressor. The electric compressor, powered by the 48-volt mild-hybrid system, effectively eliminates turbo lag, providing instant throttle response and a more linear power delivery. The EQ Boost system adds a further 22 horsepower and 250 Nm (184 lb-ft) of torque, assisting the engine during acceleration and smoothing out shifts. The engine’s code, M 256.930, signifies its advanced design and performance capabilities. Power is transmitted to all four wheels via Mercedes-Benz’s 4MATIC+ all-wheel-drive system and a nine-speed TCT (Torque Clutch Transmission) automatic gearbox, known for its quick and smooth shifts.
Driving Characteristics
The CLS 53 AMG delivers a refined yet potent driving experience. The EQ Boost system contributes to remarkably responsive acceleration, with the car reaching 60 mph in approximately 4.3 seconds. The inline-six engine provides a broad torque curve, making it feel strong and effortless in everyday driving situations. Compared to the more aggressively tuned AMG 63 S, the CLS 53 prioritizes comfort and usability. The suspension, while firm enough to provide confident handling, is not overly harsh, making it suitable for long journeys. The nine-speed automatic transmission is well-programmed, offering seamless gear changes and contributing to the car’s overall smoothness. While not as raw or visceral as some of its competitors, the CLS 53 offers a compelling balance of performance and luxury.
Equipment & Trim Levels
The CLS 53 AMG came generously equipped as standard. Interior features typically included premium leather upholstery, heated and ventilated front seats, a panoramic sunroof, and a high-end Burmester sound system. The MBUX infotainment system, with its intuitive interface and voice control, was also standard. Optional extras included a head-up display, advanced driver-assistance systems (such as adaptive cruise control and lane-keeping assist), and various cosmetic enhancements. The interior design was characterized by its sleek lines, high-quality materials, and ambient lighting, creating a luxurious and sophisticated atmosphere.
Chassis & Braking
The CLS 53 AMG features a sophisticated chassis designed to deliver both comfort and handling. It utilizes an independent multi-link suspension at both the front and rear, providing excellent ride quality and precise control. The car is equipped with ventilated disc brakes on all four wheels, offering strong stopping power. The AMG-tuned suspension and steering systems enhance the car’s agility and responsiveness. The 4MATIC+ all-wheel-drive system provides excellent traction in all weather conditions, distributing torque variably between the front and rear axles as needed.
Market Reception & Comparison
The CLS 53 AMG was generally well-received by automotive critics. It was praised for its innovative powertrain, refined driving experience, and luxurious interior. However, some reviewers noted that it lacked the outright aggression of the AMG 63 S model. Compared to rivals such as the Audi S7 and BMW 840i, the CLS 53 offered a unique combination of performance, efficiency, and technology. Its fuel economy, while not exceptional, was respectable for a high-performance coupe. Reliability reports have been generally positive, with few major issues reported.
Legacy
The Mercedes-Benz CLS 53 AMG represents an important step in the evolution of performance vehicles. Its innovative EQ Boost system paved the way for further electrification of the AMG lineup. Today, the C257 CLS 53 AMG remains a desirable used car, offering a compelling blend of performance, luxury, and technology. The M 256 engine, with its advanced features, has proven to be a reliable and durable powerplant, ensuring that these cars will continue to provide years of driving enjoyment. The CLS 53’s legacy lies in its ability to seamlessly integrate mild-hybrid technology into a high-performance coupe, setting a new standard for refinement and efficiency.
