The Mercedes-Benz E-Class Coupe (C238) E 300 258 Hp EQ Boost 9G-TRONIC represents a sophisticated blend of performance and efficiency within the fifth generation of the E-Class Coupe, produced from 2018 to 2020. This variant occupied a key position in the lineup, serving as a mid-range offering that balanced luxury features with a potent, yet relatively fuel-efficient powertrain. It was designed to appeal to buyers seeking a stylish two-door coupe with modern technology and a comfortable driving experience. The introduction of EQ Boost mild-hybrid technology marked a significant step towards electrification for the E-Class range.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | E-class |
| Generation | E-class Coupe (C238) |
| Type (Engine) | E 300 (258 Hp) EQ Boost 9G-TRONIC |
| Start of production | 2018 |
| End of production | 2020 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption at Low speed (WLTP) | 7.1 l/100 km (33.1 US mpg, 39.8 UK mpg, 14.1 km/l) |
| Fuel consumption at very high speed (WLTP) | 8.1 l/100 km (29 US mpg, 34.9 UK mpg, 12.3 km/l) |
| CO2 emissions (WLTP) | 161-189 g/km |
| Fuel consumption (economy) – urban | 8.2-8.5 l/100 km (28.7 – 27.7 US mpg, 34.4 – 33.2 UK mpg, 12.2 – 11.8 km/l) |
| Fuel consumption (economy) – extra urban | 5.3-5.5 l/100 km (44.4 – 42.8 US mpg, 53.3 – 51.4 UK mpg, 18.9 – 18.2 km/l) |
| Fuel consumption (economy) – combined | 6.4-6.6 l/100 km (36.8 – 35.6 US mpg, 44.1 – 42.8 UK mpg, 15.6 – 15.2 km/l) |
| CO2 emissions | 146-150 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.4 sec |
| Acceleration 0 – 62 mph | 6.4 sec |
| Acceleration 0 – 60 mph | 6.1 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 6d-TEMP-EVAP-ISC |
| Weight-to-power ratio | 6.6 kg/Hp, 150.9 Hp/tonne |
| Weight-to-torque ratio | 4.6 kg/Nm, 216.4 Nm/tonne |
| Battery voltage | 48 V |
| Electric motor power | 14 Hp |
| Electric motor location | Front, Longitudinal |
| 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 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-scroll turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.6 l (6.97 US qt | 5.81 UK qt) |
| Kerb Weight | 1710 kg (3769.9 lbs.) |
| Max. weight | 2320 kg (5114.72 lbs.) |
| Max load | 610 kg (1344.82 lbs.) |
| Trunk (boot) space – minimum | 425 l (15.01 cu. ft.) |
| 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 | 4826 mm (190 in.) |
| Width | 1860 mm (73.23 in.) |
| Width including mirrors | 2055 mm (80.91 in.) |
| Height | 1430 mm (56.3 in.) |
| Wheelbase | 2873 mm (113.11 in.) |
| Front track | 1605 mm (63.19 in.) |
| Rear (Back) track | 1609 mm (63.35 in.) |
| Front overhang | 841 mm (33.11 in.) |
| Rear overhang | 1112 mm (43.78 in.) |
| Drivetrain Architecture | Rear wheel drive. MHEV. ICE and electric motor drive the rear wheels. |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
INTRODUCTION
The C238 E-Class Coupe, launched in 2017, represented a significant departure from its predecessor, adopting a more fluid and dynamic design language. The E 300 258 Hp EQ Boost variant, produced between 2018 and 2020, was a key component of this generation. It slotted into the middle of the coupe range, offering a compelling combination of performance, luxury, and efficiency. The EQ Boost system, a 48-volt mild-hybrid setup, provided an additional 14 horsepower and allowed for features like extended coasting and smoother start/stop operation. This model was primarily aimed at the European and North American markets, where demand for stylish, technologically advanced coupes remained strong.
Powertrain & Engine Architecture
At the heart of the E 300 EQ Boost lies the M 264.920 2.0-liter inline-four cylinder engine. This engine is a member of Mercedes-Benz’s modular engine family, known for its efficiency and refinement. It utilizes direct fuel injection, a twin-scroll turbocharger, and an intercooler to deliver 258 horsepower and 370 Nm (272.9 lb-ft) of torque between 1800 and 4000 rpm. The EQ Boost system adds a 48-volt electric motor integrated into the transmission, providing a temporary power boost and enabling features like regenerative braking. The 9G-TRONIC nine-speed automatic transmission is standard, offering smooth and efficient gear changes. This transmission is electronically controlled and adapts to driving conditions to optimize fuel economy and performance. The engine’s valvetrain employs Dual Overhead Camshafts (DOHC) with four valves per cylinder, contributing to its responsive nature.
Driving Characteristics
The E 300 258 Hp EQ Boost delivers a refined and comfortable driving experience. While not as overtly sporty as some of its competitors, it offers ample power for everyday driving and confident highway cruising. The EQ Boost system provides a noticeable surge of power during acceleration, enhancing responsiveness. The 9G-TRONIC transmission is well-tuned, providing seamless gear changes and contributing to a relaxed driving experience. Compared to the base E 200 models, the E 300 offers significantly more power and a more engaging driving experience. While lacking the outright performance of the E 450 or AMG variants, the E 300 strikes a good balance between performance and efficiency. The rear-wheel drive configuration provides a balanced feel, although all-wheel drive (4MATIC) was also available as an option.
Equipment & Trim Levels
The E 300 EQ Boost came well-equipped as standard, reflecting its position as a mid-range offering. Standard features typically included leather upholstery, heated front seats, a premium sound system, and a comprehensive suite of safety features, including automatic emergency braking, lane keeping assist, and adaptive cruise control. The infotainment system featured a large central display screen controlled by a rotary dial and touchpad. Optional extras included a panoramic sunroof, upgraded leather upholstery, a head-up display, and advanced driver-assistance systems. Trim levels varied slightly depending on the market, but generally offered options for customizing the interior and exterior appearance.
Chassis & Braking
The E-Class Coupe (C238) features a sophisticated chassis design focused on comfort and handling. It utilizes an independent multi-link suspension at both the front and rear, providing a smooth and controlled ride. The suspension is tuned to prioritize comfort, but still offers good body control in corners. Ventilated disc brakes are fitted to all four wheels, providing ample stopping power. The E 300 typically came equipped with 18-inch alloy wheels as standard, with larger sizes available as options. The steering system is electric power-assisted, offering precise and responsive steering feel.
Market Reception & Comparison
The E 300 EQ Boost was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and advanced technology. The EQ Boost system was seen as a positive step towards electrification, improving fuel economy and enhancing the driving experience. Compared to its rivals, such as the BMW 4 Series and Audi A5 Coupe, the E 300 offered a compelling combination of luxury, performance, and technology. Fuel economy figures were competitive, with combined fuel consumption ranging from 6.4 to 6.6 l/100 km. Reliability reports have been generally positive, although some owners have reported minor issues with the infotainment system.
Legacy
The E 300 258 Hp EQ Boost represents an important step in Mercedes-Benz’s transition towards electrified powertrains. The introduction of the EQ Boost system paved the way for more advanced hybrid and electric models. In the used car market, these models are generally sought after for their blend of luxury, performance, and technology. The M 264 engine has proven to be a reliable unit, and the 9G-TRONIC transmission is known for its smooth operation. As with any used vehicle, potential buyers should carefully inspect the car’s maintenance history and consider a pre-purchase inspection by a qualified mechanic.
