The Mercedes-Benz C 300 4MATIC, introduced as part of the W206 C-Class generation in 2021, represents a significant evolution in the compact executive car segment. This variant, equipped with a 2.0-liter turbocharged inline-four engine augmented by a 48-volt mild hybrid system (EQ Boost), and paired with a 9G-TRONIC automatic transmission, occupies a central position within the C-Class lineup, offering a balance of performance, efficiency, and luxury. It replaced the previous C 300 models powered solely by internal combustion engines, signaling Mercedes-Benz’s commitment to electrification and improved fuel economy. The W206 C-Class, built on an updated version of the MRA2 platform, aimed to deliver a more refined driving experience and a technologically advanced interior compared to its W205 predecessor.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-class |
| Generation | C-class (W206) |
| Type | C 300 (258 Hp) EQ Boost 4MATIC 9G-TRONIC |
| Start of production | 2021 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 7-7.9 l/100 km (33.6 – 29.8 US mpg) |
| CO2 emissions (WLTP) | 160-180 g/km |
| Fuel consumption (urban – NEDC) | 10-10.2 l/100 km (23.5 – 23.1 US mpg) |
| Fuel consumption (extra urban – NEDC) | 5.3-5.7 l/100 km (44.4 – 41.3 US mpg) |
| Fuel consumption (combined – NEDC) | 7-7.3 l/100 km (33.6 – 32.2 US mpg) |
| CO2 emissions (NEDC) | 161-168 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6 sec |
| Acceleration 0 – 62 mph | 6 sec |
| Acceleration 0 – 60 mph | 5.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 6.4 kg/Hp |
| Weight-to-torque ratio | 4.1 kg/Nm |
| Gross battery capacity | 0.9 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 20 Hp |
| Electric motor Torque | 200 Nm (147.51 lb.-ft.) |
| Power | 258 Hp @ 5800 rpm |
| Torque | 400 Nm @ 2000-3200 rpm (295.02 lb.-ft. @ 2000-3200 rpm) |
| Engine displacement | 1999 cm3 (121.99 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Compression ratio | 10:1 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-scroll turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Kerb Weight | 1655 kg (3648.65 lbs.) |
| Max. weight | 2335 kg (5147.79 lbs.) |
| Max load | 680 kg (1499.14 lbs.) |
| Trunk (boot) space | 455 l (16.07 cu. ft.) |
| Fuel tank capacity | 50 l (13.21 US gal | 11 UK gal) |
| Length | 4751 mm (187.05 in.) |
| Width | 1820 mm (71.65 in.) |
| Height | 1437 mm (56.57 in.) |
| Wheelbase | 2865 mm (112.8 in.) |
| Number of gears | 9 |
| Gearbox type | Automatic (G-TRONIC) |
Powertrain & Engine Architecture
The heart of the C 300 4MATIC is the M 254.920 2.0-liter inline-four cylinder engine. This engine utilizes direct fuel injection and a twin-scroll turbocharger to deliver a responsive and efficient power output. The key innovation is the integration of a 48-volt mild hybrid system, featuring a belt-driven integrated starter-generator (ISG). This ISG provides several functions, including regenerative braking to recapture energy, a smooth start/stop function, and a temporary power boost of up to 20 horsepower and 200 Nm (147.51 lb.-ft.) through the “EQ Boost” system. The 9G-TRONIC nine-speed automatic transmission is standard, offering smooth and quick shifts. The transmission is designed to work seamlessly with the mild hybrid system, optimizing fuel efficiency and performance. The engine’s layout is front-mounted and longitudinal, driving all four wheels via the 4MATIC all-wheel-drive system.
Driving Characteristics
The C 300 4MATIC delivers a refined and comfortable driving experience. The EQ Boost system provides a noticeable surge of power during acceleration, enhancing responsiveness. While not as overtly sporty as some of its competitors, the C 300 offers ample power for everyday driving and highway cruising. The 9G-TRONIC transmission is well-tuned, providing smooth gear changes and contributing to a relaxed driving experience. Compared to earlier C-Class models with solely internal combustion engines, the C 300 4MATIC exhibits improved fuel economy and reduced emissions. The all-wheel-drive system provides excellent traction in various weather conditions. The gear ratios are optimized for both fuel efficiency and acceleration, with a focus on providing a broad torque curve.
Equipment & Trim Levels
The C 300 4MATIC typically comes standard with a generous array of features, including Mercedes-Benz User Experience (MBUX) infotainment system with a large touchscreen display, premium upholstery, automatic climate control, and a suite of advanced driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. Optional extras include a panoramic sunroof, premium sound system, head-up display, and various interior trim options. Interior upholstery options generally include MB-Tex artificial leather and genuine leather. The dashboard configuration is modern and minimalist, emphasizing the large central touchscreen display.
Chassis & Braking
The W206 C-Class features a sophisticated chassis design with a four-link front suspension and a multi-link rear suspension. This setup provides a comfortable ride while maintaining good handling characteristics. The C 300 4MATIC is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The electronic stability program (ESP) and anti-lock braking system (ABS) are standard features. Steering is via a rack-and-pinion system with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The C 300 4MATIC has been generally well-received by automotive critics, who praise its refined driving experience, luxurious interior, and advanced technology. Compared to other trims in the C-Class lineup, such as the C 200, the C 300 offers significantly more power and performance. While the C 300’s fuel economy is improved compared to previous generations, it may not match the efficiency of diesel-powered C-Class models. Competitors in the compact executive car segment, such as the BMW 3 Series and Audi A4, offer similar levels of performance and luxury, but the C 300 4MATIC distinguishes itself with its advanced mild hybrid technology and sophisticated interior design.
Legacy
The C 300 4MATIC represents a key step in Mercedes-Benz’s transition towards electrification. The integration of the 48-volt mild hybrid system demonstrates the company’s commitment to improving fuel efficiency and reducing emissions. While long-term reliability data is still emerging, the M 254 engine family has proven to be generally robust. On the used car market, the W206 C 300 4MATIC is expected to hold its value well due to its desirable combination of performance, luxury, and technology. The powertrain is anticipated to be relatively reliable, although regular maintenance, including oil changes and inspection of the mild hybrid system components, will be crucial for ensuring long-term durability.
