The Mercedes-Benz CLA 45 S 4MATIC+ represents the pinnacle of performance within the C118 CLA Coupe facelift range, introduced in January 2023. This variant, boasting 421 horsepower, is positioned as the high-performance flagship, catering to enthusiasts seeking a compact executive car with substantial power and advanced technology. It builds upon the foundation of the C118 platform (shared with the A-Class) and represents a significant upgrade over the standard CLA models, offering a more aggressive aesthetic and a dramatically enhanced driving experience. The “S” designation denotes the highest performance tier within the 45 AMG family.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | CLA |
| Generation | CLA Coupe (C118, facelift 2023) |
| Type | AMG CLA 45 S (421 Hp) 4MATIC+ AMG SPEEDSHIFT DCT 8G |
| Start of production | January, 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 8.7-9 l/100 km (27 – 26.1 US mpg, 32.5 – 31.4 UK mpg, 11.5 – 11.1 km/l) |
| CO2 emissions (WLTP) | 196-205 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.1 sec |
| Acceleration 0 – 62 mph | 4.1 sec |
| Acceleration 0 – 60 mph | 3.9 sec |
| Maximum speed | 270 km/h (167.77 mph), Electronically limited |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 3.9 kg/Hp, 255.9 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 304 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 139.980 |
| Engine displacement | 1991 cm3 (121.5 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 9:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection and Multi-port manifold injection |
| Engine aspiration | Twin-scroll turbo, Intercooler |
| Valvetrain | DOHC, CAMTRONIC |
| Engine oil capacity | 5.8 l (6.13 US qt | 5.1 UK qt) |
| Coolant | 11.6 l (12.26 US qt | 10.21 UK qt) |
| Kerb Weight | 1645 kg (3626.6 lbs.) |
| Max. weight | 2175 kg (4795.05 lbs.) |
| Max load | 530 kg (1168.45 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Fuel tank capacity | 51 l (13.47 US gal | 11.22 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4701 mm (185.08 in.) |
| Width | 1857 mm (73.11 in.) |
| Width including mirrors | 1999 mm (78.7 in.) |
| Height | 1407 mm (55.39 in.) |
| Wheelbase | 2729 mm (107.44 in.) |
| Front track | 1616 mm (63.62 in.) |
| Rear (Back) track | 1596 mm (62.83 in.) |
| Front overhang | 933 mm (36.73 in.) |
| Rear overhang | 1039 mm (40.91 in.) |
| Minimum turning circle (turning diameter) | 11.6 m (38.06 ft.) |
| Drivetrain Architecture | All wheel drive (4×4). Internal Combustion engine. The Internal combustion engine (ICE) drives the front wheels permanently, and the rear wheels are driven through an electrically or mechanically operated clutch if necessary. |
| Number of gears and type of gearbox | 8 gears, automatic transmission AMG SPEEDSHIFT DCT |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| 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 | 19 |
Powertrain & Engine Architecture
The heart of the CLA 45 S is the M139 980 2.0-liter turbocharged inline-four engine. This engine is notable for its numerous technological advancements, including a twin-scroll turbocharger, direct fuel injection, and CAMTRONIC variable valve timing. The engine’s cylinder head is designed with intake and exhaust valves swapped, allowing for a more direct flow and improved combustion efficiency. The M139 produces 421 horsepower at 6750 rpm and 368.78 lb-ft of torque between 5000 and 5250 rpm. This output is achieved through a high compression ratio of 9:1 and sophisticated engine management software. The engine is paired with an 8-speed AMG SPEEDSHIFT DCT (Dual Clutch Transmission) which provides incredibly fast and precise gear changes. This transmission is specifically tuned for performance, offering a more aggressive shift pattern in Sport and Sport+ modes.
Driving Characteristics
The CLA 45 S delivers exhilarating performance. The combination of the powerful engine and the quick-shifting DCT results in a 0-60 mph time of just 3.9 seconds, and a limited top speed of 167.77 mph. The 4MATIC+ all-wheel-drive system is torque-vectoring, meaning it can distribute power between the front and rear axles, and even between individual rear wheels, to maximize traction and agility. Compared to lower-powered CLA variants, the 45 S offers a significantly more responsive and engaging driving experience. The steering is precise and well-weighted, and the suspension is firm but controlled, providing excellent body control in corners. While the ride can be somewhat firm on rough roads, it’s a worthwhile trade-off for the exceptional handling capabilities.
Equipment & Trim Levels
The CLA 45 S comes standard with a comprehensive list of features, including AMG-specific styling elements (aggressive front fascia, rear diffuser, quad exhaust outlets), a sport-tuned suspension, and high-performance brakes. Inside, the cabin features sport seats upholstered in premium leather and Dinamica microfiber, along with AMG-branded steering wheel and pedals. Standard technology includes a dual 10.25-inch display screen (instrument cluster and infotainment system), Mercedes-Benz User Experience (MBUX) voice control, and a Burmester surround sound system. Optional extras include carbon fiber trim, panoramic sunroof, and advanced driver-assistance systems.
Chassis & Braking
The CLA 45 S features a McPherson strut front suspension and a multi-link rear suspension, both specifically tuned for performance. The suspension geometry and damping characteristics are optimized to minimize body roll and maximize grip. The braking system consists of ventilated discs at all four corners, with large calipers providing ample stopping power. The AMG high-performance braking system, available as an option, further enhances braking performance with even larger rotors and calipers.
Market Reception & Comparison
The CLA 45 S was generally well-received by automotive critics, who praised its impressive performance, handling, and technology. However, some reviewers noted that the ride could be firm and that the interior, while well-appointed, lacked the ultimate luxury of some competitors. Compared to other high-performance compact cars, such as the BMW M235i/M240i and Audi S3, the CLA 45 S offered a unique combination of power, technology, and style. Fuel economy, while not a priority for this segment, is rated at 8.7-9 l/100 km, which is reasonable for a car of this performance level.
Legacy
The M139 engine, as found in the CLA 45 S, has proven to be a robust and reliable powertrain. While long-term reliability data is still emerging, early reports suggest that the engine is generally durable, provided it is properly maintained. The CLA 45 S has established itself as a desirable and sought-after model in the used car market, appealing to enthusiasts who appreciate its performance and exclusivity. Its advanced technology and potent engine continue to make it a compelling option in the high-performance compact car segment.
