The Mercedes-Benz C 300, as part of the W205 facelift generation produced from 2018 to 2021, represented a significant evolution of the brand’s compact executive sedan. This variant, equipped with a 2.0-liter turbocharged inline-four engine producing 258 horsepower and incorporating EQ Boost mild-hybrid technology paired with a 9G-TRONIC nine-speed automatic transmission, occupied a sweet spot in the C-Class lineup, offering a blend of performance, efficiency, and luxury features. It served as a popular alternative to the base C 300 models and bridged the gap to the more performance-oriented AMG variants.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-class |
| Generation | C-class (W205, facelift 2018) |
| Type | C 300 (258 Hp) EQ Boost 9G-TRONIC |
| Start of production | 2018 |
| End of production | 2021 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption at Low speed (WLTP) | 6.9 l/100 km (34.1 US mpg) |
| Fuel consumption at very high speed (WLTP) | 7.9 l/100 km (29.8 US mpg) |
| CO2 emissions (WLTP) | 157-179 g/km |
| Fuel consumption (urban) | 8.9-9.3 l/100 km (26.4 – 25.3 US mpg) |
| Fuel consumption (extra urban) | 5.1-5.5 l/100 km (46.1 – 42.8 US mpg) |
| Fuel consumption (combined) | 6.5-6.9 l/100 km (36.2 – 34.1 US mpg) |
| CO2 emissions | 148-158 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.9 sec |
| Acceleration 0 – 62 mph | 5.9 sec |
| Acceleration 0 – 60 mph | 5.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.7 kg/Hp |
| Weight-to-torque ratio | 4 kg/Nm |
| Electric motor power | 14 Hp |
| Power | 258 Hp |
| Torque | 370 Nm @ 1800-4000 rpm (272.9 lb.-ft. @ 1800-4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 264.920 |
| Engine displacement | 1991 cm3 (121.5 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Fuel injection system | Direct injection |
| Engine oil capacity | 6.6 l (6.97 US qt | 5.81 UK qt) |
| Coolant capacity | 8.6 l (9.09 US qt | 7.57 UK qt) |
| Kerb Weight | 1480 kg (3262.84 lbs.) |
| Max. weight | 2135 kg (4706.87 lbs.) |
| Max load | 655 kg (1444.03 lbs.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Permitted trailer load (braked) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load (unbraked) | 750 kg (1653.47 lbs.) |
| Length | 4686 mm (184.49 in.) |
| Width | 1810 mm (71.26 in.) |
| Height | 1442 mm (56.77 in.) |
| Wheelbase | 2840 mm (111.81 in.) |
| Gearbox | 9 gears, automatic transmission G-TRONIC |
INTRODUCTION
The W205 facelift C 300 with EQ Boost, launched in 2018, represented a mid-cycle refresh of the fifth-generation C-Class. Built on the MRA (Modular Rear-wheel-drive Architecture) platform, it aimed to refine the already successful formula with updated styling, enhanced technology, and improved efficiency. The introduction of the 48-volt EQ Boost system marked a key step towards electrification for Mercedes-Benz, providing a mild hybrid assist to the gasoline engine. This variant was positioned as a premium offering, appealing to buyers seeking a balance between performance, comfort, and fuel economy in a compact luxury sedan.
Powertrain & Engine Architecture
At the heart of the C 300 lies the M 264.920 2.0-liter inline-four cylinder engine. This engine utilizes direct fuel injection and a single turbocharger with an intercooler to deliver 258 horsepower and 272.9 lb.-ft. of torque. The EQ Boost system adds a 14 horsepower electric motor integrated into the drivetrain, providing a boost during acceleration and enabling a smoother start/stop function. This mild-hybrid setup doesn’t allow for all-electric driving, but it significantly improves fuel efficiency and responsiveness. The engine’s valvetrain features four valves per cylinder, optimizing airflow for increased power output. The 9G-TRONIC nine-speed automatic transmission is a crucial component, offering smooth and efficient gear changes. It’s designed to work seamlessly with the EQ Boost system, optimizing power delivery and fuel consumption.
Driving Characteristics
The C 300 EQ Boost delivers a refined and engaging driving experience. The combination of the turbocharged engine and the electric motor provides strong acceleration, with a 0-60 mph time of around 5.7 seconds. The 9G-TRONIC transmission contributes to smooth gear changes, and the EQ Boost system provides an immediate power boost when needed. Compared to earlier C 300 models without the EQ Boost, this variant feels more responsive and refined. While not as overtly sporty as the AMG C 43 or C 63 models, the C 300 offers ample power for everyday driving and comfortable highway cruising. The gear ratios are tuned for a balance between acceleration and fuel efficiency, with taller gears for relaxed cruising and shorter gears for quicker response.
Equipment & Trim Levels
The C 300 EQ Boost came standard with a generous array of features, including MB-Tex upholstery, dual 12.3-inch displays for the instrument cluster and infotainment system, Apple CarPlay and Android Auto integration, and a suite of advanced driver-assistance systems such as adaptive cruise control and lane-keeping assist. Optional extras included leather upholstery, a premium Burmester sound system, a panoramic sunroof, and various interior trim options. The interior design was characterized by its elegant and modern aesthetic, with high-quality materials and a focus on comfort. Trim levels offered varying degrees of luxury and technology, allowing buyers to customize their C 300 to their preferences.
Chassis & Braking
The W205 C-Class features a sophisticated chassis design with a four-wheel independent suspension. The front suspension utilizes a three-link design, while the rear suspension employs a multi-link setup. This configuration provides a comfortable ride while maintaining good handling characteristics. The C 300 typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) and electronic stability control are standard features, enhancing safety and control. The steering system is a rack-and-pinion setup with electric power steering, offering precise and responsive steering feel.
Market Reception & Comparison
The C 300 EQ Boost was generally well-received by automotive critics. It was praised for its refined driving experience, fuel efficiency, and advanced technology. Compared to other trims in the C-Class lineup, the C 300 EQ Boost offered a compelling balance between performance and economy. It was more fuel-efficient than the higher-output AMG models, while still providing ample power for most drivers. Its mild-hybrid system was seen as a step in the right direction towards electrification, and its smooth and responsive powertrain was a highlight. Competitors in this segment included the BMW 3 Series, Audi A4, and Lexus IS.
Legacy
The C 300 EQ Boost represents an important milestone in Mercedes-Benz’s transition towards electrified powertrains. The M 264 engine and 9G-TRONIC transmission have proven to be reliable and durable, and the EQ Boost system has generally held up well over time. In the used car market, these models are sought after for their blend of luxury, performance, and efficiency. While some maintenance costs associated with the advanced technology may be higher than those of older models, the C 300 EQ Boost remains a desirable and well-regarded compact luxury sedan.
