The Mercedes-Benz C 400 Cabriolet, produced from 2018 to 2023 as part of the A205 facelift generation, represented a compelling blend of luxury, performance, and open-air driving enjoyment. Positioned as a mid-to-upper trim level within the C-Class Cabriolet range, it offered a significant step up in power and refinement compared to the base C 300 models, while remaining more accessible than the high-performance AMG variants. This variant aimed to appeal to buyers seeking a sophisticated and capable grand tourer with the added thrill of a convertible experience.
Technical Specifications
| Fuel consumption at Low speed (WLTP) | 8.6 l/100 km (27.4 US mpg, 32.8 UK mpg, 11.6 km/l) |
| Fuel consumption at very high speed (WLTP) | 9.4 l/100 km (25 US mpg, 30.1 UK mpg, 10.6 km/l) |
| CO2 emissions (WLTP) | 194-213 g/km |
| Fuel consumption (economy) – urban | 11.3-11.8 l/100 km (20.8 – 19.9 US mpg, 25 – 23.9 UK mpg, 8.8 – 8.5 km/l) |
| Fuel consumption (economy) – extra urban | 6.4-6.9 l/100 km (36.8 – 34.1 US mpg, 44.1 – 40.9 UK mpg, 15.6 – 14.5 km/l) |
| Fuel consumption (economy) – combined | 8.2-8.7 l/100 km (28.7 – 27 US mpg, 34.4 – 32.5 UK mpg, 12.2 – 11.5 km/l) |
| CO2 emissions | 187-198 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.2 sec |
| Acceleration 0 – 62 mph | 5.2 sec |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.4 kg/Hp, 186.6 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 268.9 Nm/tonne |
| Power | 333 Hp |
| Power per litre | 111.1 Hp/l |
| Torque | 480 Nm @ 1600-4000 rpm (354.03 lb.-ft. @ 1600-4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 276.823 |
| Engine displacement | 2996 cm3 (182.83 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt, 5.72 UK qt) |
| Coolant | 10.9 l (11.52 US qt, 9.59 UK qt) |
| Kerb Weight | 1785 kg (3935.25 lbs.) |
| Max. weight | 2325 kg (5125.75 lbs.) |
| Max load | 540 kg (1190.5 lbs.) |
| Fuel tank capacity | 66 l (17.44 US gal, 14.52 UK gal) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4686 mm (184.49 in.) |
| Width | 1810 mm (71.26 in.) |
| Height | 1409 mm (55.47 in.) |
| Wheelbase | 2840 mm (111.81 in.) |
| Front track | 1567 mm (61.69 in.) |
| Front overhang | 790 mm (31.1 in.) |
| Rear overhang | 1056 mm (41.57 in.) |
| Ride height (ground clearance) | 88 mm (3.46 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
INTRODUCTION
The A205 C-Class Cabriolet, launched in 2016 and receiving a significant facelift in 2018, brought open-top motoring back to the C-Class lineup after a long hiatus. The C 400 4MATIC variant, produced from 2018-2023, occupied a sweet spot in the range, offering a substantial performance upgrade over the base models without venturing into the territory of the more focused AMG versions. It was designed to provide a luxurious and engaging driving experience, appealing to buyers who desired both comfort and capability. The facelift brought updated styling, improved technology, and refined engine options, solidifying the C-Class Cabriolet’s position in the premium convertible segment.
Powertrain & Engine Architecture
At the heart of the C 400 Cabriolet lies the M276.823 3.0-liter V6 engine. This engine is a member of Mercedes-Benz’s modular engine family, known for its smooth operation and robust construction. The M276 features direct fuel injection, a twin-turbocharger setup (one turbocharger per cylinder bank), and variable valve timing on both the intake and exhaust sides. This configuration delivers a broad torque curve and responsive power delivery. The engine produces 333 horsepower and 480 Nm (354 lb-ft) of torque, available from a low 1600 rpm, providing ample power for both relaxed cruising and spirited driving.
The engine is paired with Mercedes-Benz’s 9G-TRONIC nine-speed automatic transmission. This transmission is renowned for its smooth and quick shifts, contributing to both performance and fuel efficiency. The 9G-TRONIC features a wide gear ratio spread, allowing the engine to operate in its optimal efficiency range more often. The 4MATIC all-wheel-drive system distributes power between the front and rear axles, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The C 400 Cabriolet delivers a refined and engaging driving experience. The combination of the V6 engine and the 9G-TRONIC transmission provides effortless acceleration, with a 0-60 mph time of around 4.9 seconds. The all-wheel-drive system ensures confident handling and stability, even on slippery surfaces. While not as overtly sporty as the AMG variants, the C 400 offers a satisfying level of performance for everyday driving and occasional spirited runs. The automatic transmission is generally smooth and responsive, although some drivers may prefer the more direct control of a manual gearbox. The suspension strikes a good balance between comfort and handling, providing a compliant ride without feeling overly soft in corners.
Equipment & Trim Levels
The C 400 Cabriolet came well-equipped as standard, including features such as leather upholstery, heated front seats, a premium sound system, and a comprehensive suite of safety technologies. Optional extras included features such as a panoramic sunroof, advanced driver-assistance systems (like adaptive cruise control and lane-keeping assist), and upgraded interior trim options. The interior design was characterized by its elegant styling and high-quality materials. The dashboard featured a prominent infotainment screen, controlled by a rotary dial and touchpad.
Chassis & Braking
The C 400 Cabriolet utilizes a four-wheel independent suspension system, with multi-link setups at both the front and rear. This configuration provides a comfortable ride and precise handling. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Anti-lock brakes (ABS), electronic stability control (ESC), and traction control are standard features, enhancing safety and control. The steering is electrically assisted, offering a precise and responsive feel.
Market Reception & Comparison
The C 400 Cabriolet was generally well-received by automotive critics, who praised its blend of luxury, performance, and refinement. It was often compared to rivals such as the BMW 4 Series Convertible and the Audi A5 Cabriolet. The C 400 offered a compelling alternative, with its more powerful engine and luxurious interior. Fuel economy was respectable for a performance-oriented convertible, although it wasn’t the most fuel-efficient option in the segment. Reliability was generally good, although some owners reported minor issues with the infotainment system.
Legacy
The Mercedes-Benz C 400 Cabriolet remains a desirable used car today, offering a compelling combination of style, performance, and luxury. The M276 V6 engine is known for its durability and relatively straightforward maintenance. While not as sought-after as the AMG variants, the C 400 provides a more accessible entry point into the world of Mercedes-Benz convertibles. Its blend of comfort, performance, and all-weather capability makes it a versatile and enjoyable grand tourer for those seeking an open-air driving experience.
