The Mercedes-Benz CLA 45 S 4MATIC+ represents the pinnacle of performance within the C118 CLA Coupe range, produced from 2019 to 2023. Positioned as the flagship model, it delivers substantial power and sophisticated technology, targeting enthusiasts seeking a compact executive car with genuine sports car credentials. This variant distinguishes itself from the standard CLA models, and even the ‘lower’ 45 variants, through its enhanced engine output, upgraded drivetrain components, and more aggressive styling. It occupies the premium segment of the compact coupe market, competing with vehicles like the Audi RS3 and BMW M2.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLA |
| Generation | CLA Coupe (C118) |
| Type | AMG CLA 45 S (421 Hp) 4MATIC+ AMG SPEEDSHIFT DCT 8G |
| Start of production | 2019 |
| End of production | 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption at Low speed (WLTP) | 8.2 l/100 km (28.7 US mpg, 34.4 UK mpg, 12.2 km/l) |
| Fuel consumption at very high speed (WLTP) | 8.5 l/100 km (27.7 US mpg, 33.2 UK mpg, 11.8 km/l) |
| CO2 emissions (WLTP) | 186-194 g/km |
| Fuel consumption (economy) – urban | 10.3-10.4 l/100 km (22.8 – 22.6 US mpg, 27.4 – 27.2 UK mpg, 9.7 – 9.6 km/l) |
| Fuel consumption (economy) – extra urban | 6.9-7.0 l/100 km (34.1 – 33.6 US mpg, 40.9 – 40.4 UK mpg, 14.5 – 14.3 km/l) |
| Fuel consumption (economy) – combined | 8.1-8.3 l/100 km (29 – 28.3 US mpg, 34.9 – 34 UK mpg, 12.3 – 12 km/l) |
| CO2 emissions | 186-189 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4 sec |
| Acceleration 0 – 62 mph | 4 sec |
| Acceleration 0 – 60 mph | 3.8 sec |
| Maximum speed | 270 km/h (167.77 mph) |
| Emission standard | Euro 6d ISC-FCM |
| Weight-to-power ratio | 3.8 kg/Hp, 263.1 Hp/tonne |
| Weight-to-torque ratio | 3.2 kg/Nm, 312.5 Nm/tonne |
| Power | 421 Hp @ 6750 rpm |
| Power per litre | 211.5 Hp/l |
| Torque | 500 Nm @ 5000-5250 rpm (368.78 lb.-ft. @ 5000-5250 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | M 139 |
| Engine displacement | 1991 cm3 (121.5 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | CAMTRONIC |
| Kerb Weight | 1600 kg (3527.4 lbs.) |
| Max. weight | 2145 kg (4728.92 lbs.) |
| Max load | 545 kg (1201.52 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Fuel tank capacity | 51 l (13.47 US gal, 11.22 UK gal) |
| Permitted trailer load with brakes (12%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4688 mm (184.57 in.) |
| Width | 1830 mm (72.05 in.) |
| Height | 1439 mm (56.65 in.) |
| Wheelbase | 2729 mm (107.44 in.) |
| Front overhang | 927 mm (36.5 in.) |
| Rear overhang | 1032 mm (40.63 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission AMG SPEEDSHIFT |
| Front suspension | Independent type McPherson |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs, 360 mm |
| Rear brakes | Ventilated discs, 330 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 255/35 R19 |
| Wheel rims size | 9J x 19 |
INTRODUCTION
The C118 Mercedes-Benz CLA, launched in 2013, aimed to bring the brand’s luxury and technology to a more accessible, compact package. The AMG CLA 45 S, introduced in 2019 as part of a mid-cycle refresh, represented the highest performance iteration of this platform. Built upon the 1HX0/A3 platform shared with other compact Mercedes-Benz models, the CLA 45 S distinguished itself with a hand-built, high-output engine and a sophisticated all-wheel-drive system. This model year saw significant upgrades over the initial CLA 45, solidifying its position as a serious contender in the high-performance compact segment. Production concluded in 2023 with the arrival of the next-generation CLA.
Powertrain & Engine Architecture
The heart of the CLA 45 S is the M139 engine, a 2.0-liter turbocharged inline-four cylinder. This engine is notable for its unique design, featuring the turbocharger positioned within the ‘hot side’ of the engine, reducing exhaust gas flow resistance and improving responsiveness. The M139 produces 421 horsepower at 6,750 rpm and 369 lb-ft of torque between 5,000 and 5,250 rpm. It utilizes direct fuel injection and CAMTRONIC variable valve timing for optimized efficiency and performance. The engine’s internals are heavily reinforced to handle the increased power output.
Power is transmitted to all four wheels via the AMG SPEEDSHIFT DCT 8G, an eight-speed dual-clutch transmission. This transmission offers incredibly fast and precise gear changes, crucial for maximizing performance. The 4MATIC+ all-wheel-drive system is fully variable, allowing for a torque split between the front and rear axles ranging from fully front-wheel drive to a 50/50 distribution. This system enhances traction and stability, particularly during spirited driving.
Driving Characteristics
The CLA 45 S delivers exhilarating acceleration, achieving 0-60 mph in approximately 3.8 seconds. The dual-clutch transmission provides near-instantaneous shifts, and the 4MATIC+ system ensures optimal grip in a variety of conditions. While the engine is highly responsive, the power delivery can feel somewhat peaky compared to larger displacement engines. The suspension is tuned for performance, offering a firm ride that minimizes body roll but may be less comfortable on rough road surfaces. The steering is precise and well-weighted, providing good feedback to the driver. Compared to the standard CLA 180 or 250 models, the CLA 45 S offers a dramatically different driving experience, prioritizing performance over comfort and fuel economy.
Equipment & Trim Levels
The CLA 45 S came standard with a comprehensive list of features, including AMG-specific styling elements, such as a more aggressive front fascia, rear diffuser, and quad exhaust outlets. The interior featured sport seats upholstered in a combination of leather and Dinamica microfiber, along with AMG-branded steering wheel and pedals. Standard technology included a 10.25-inch touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, a digital instrument cluster, and a suite of advanced driver-assistance systems. Optional extras included a panoramic sunroof, premium Burmester sound system, and various interior trim options.
Chassis & Braking
The CLA 45 S features a fully independent suspension, with McPherson struts at the front and a multi-link setup at the rear. The suspension is specifically tuned to handle the increased power and performance of the AMG variant. Larger brakes, with ventilated discs at all four corners (360mm front, 330mm rear), provide ample stopping power. The braking system is equipped with ABS and electronic brake-force distribution. The chassis is reinforced with additional bracing to improve rigidity and handling precision.
Market Reception & Comparison
The CLA 45 S was generally well-received by automotive critics, who praised its impressive performance, sophisticated technology, and stylish design. However, some reviewers noted the firm ride quality and the relatively small interior space. Compared to the standard CLA models, the 45 S offered a significant performance upgrade, but at a considerably higher price point. Fuel economy, while respectable for a high-performance car, was lower than that of the more fuel-efficient CLA variants. Against competitors like the Audi RS3 and BMW M2, the CLA 45 S offered a compelling combination of performance, luxury, and technology.
Legacy
The M139 engine, first introduced in the CLA 45 S, has proven to be a robust and reliable powertrain. While maintenance costs can be higher than those of the standard CLA models due to the more complex engine and drivetrain components, the CLA 45 S has generally demonstrated good long-term reliability. On the used car market, the CLA 45 S remains a desirable option for enthusiasts seeking a high-performance compact coupe. Its combination of power, technology, and style continues to appeal to buyers looking for a thrilling driving experience.
