2018-2020 Mercedes-Benz E-class Cabrio (A238) E 400d (340 Hp) 4MATIC 9G-TRONIC

The Mercedes-Benz E-Class Cabriolet (A238) E 400d 4MATIC, produced from September 2018 to 2020, represented a compelling blend of luxury, performance, and diesel efficiency within the E-Class range. Positioned as a high-end variant, it offered a significant step up in power and torque compared to the base models, while providing the open-air experience characteristic of a Cabriolet. This model occupied a premium space in the lineup, appealing to buyers seeking a sophisticated grand tourer with everyday usability. It was part of the fifth generation E-Class (W238) which introduced a new level of technology and refinement to the mid-size luxury segment.

Technical Specifications

INTRODUCTION

The A238 E-Class Cabriolet, launched in 2018, represented Mercedes-Benz’s commitment to open-top luxury. The E 400d 4MATIC variant, powered by the advanced OM 656 diesel engine, was a key offering within the range. This model combined the elegance of a convertible with the robust performance and efficiency of a modern diesel powerplant. It built upon the success of its predecessor, offering improved refinement, technology, and driving dynamics. The A238 generation benefited from the modular MRA (Modular Rear-wheel Architecture) platform, shared with other Mercedes-Benz models, allowing for a lighter and more rigid chassis.

Powertrain & Engine Architecture

At the heart of the E 400d 4MATIC lies the OM 656 2.9-liter inline-six cylinder diesel engine. This engine is a significant departure from the older V6 diesels used in previous E-Class generations. The OM 656 features a stepped combustion process, reducing noise and emissions. It utilizes a sophisticated diesel commonrail injection system, delivering fuel at pressures up to 2,700 bar. The engine also incorporates a variable geometry turbocharger and intercooler to optimize performance across the rev range. The 9G-TRONIC nine-speed automatic transmission is standard, offering smooth and efficient gear changes. This transmission is known for its wide gear ratios, contributing to both fuel economy and responsive acceleration. The 4MATIC all-wheel-drive system provides enhanced traction and stability, particularly in adverse weather conditions.

Driving Characteristics

The E 400d 4MATIC delivers a refined and effortless driving experience. The 700 Nm (516 lb-ft) of torque, available from a low 1200 rpm, provides strong acceleration in virtually any gear. The 0-60 mph sprint takes approximately 4.9 seconds, making it a surprisingly quick convertible. The 9G-TRONIC transmission is well-matched to the engine’s characteristics, providing seamless shifts and contributing to a relaxed cruising experience. Compared to the E 300 Cabriolet, the E 400d offers a substantial performance upgrade. While the E 300 prioritizes fuel economy, the E 400d focuses on delivering a more engaging and powerful driving experience. The all-wheel-drive system enhances handling and stability, providing confidence in various driving conditions.

Equipment & Trim Levels

The E 400d 4MATIC Cabriolet came generously equipped as standard. Key features included leather upholstery, heated and ventilated front seats, a premium sound system, and a large infotainment display with Mercedes-Benz’s MBUX (Mercedes-Benz User Experience) system. MBUX offered voice control, augmented reality navigation, and a customizable digital instrument cluster. Optional extras included air suspension (AIRMATIC), a head-up display, and various driver assistance systems such as adaptive cruise control and lane-keeping assist. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences. The Cabriolet also featured a fully automatic fabric soft top, which could be raised or lowered in around 20 seconds at speeds up to 60 km/h (37 mph).

Chassis & Braking

The A238 E-Class Cabriolet utilizes a lightweight yet rigid chassis, thanks to the extensive use of high-strength steel and aluminum. The suspension system consists of independent multi-link suspension at both the front and rear, providing a comfortable and controlled ride. The optional AIRMATIC air suspension further enhances ride quality, allowing the driver to adjust the suspension settings to suit their preferences. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. The E 400d 4MATIC also features ABS (Anti-lock Braking System), electronic stability control, and other advanced safety systems.

Market Reception & Comparison

The E 400d 4MATIC Cabriolet was generally well-received by automotive critics. It was praised for its powerful engine, refined ride, and luxurious interior. The diesel engine was noted for its quiet operation and impressive fuel economy, especially considering the car’s performance. Compared to its gasoline-powered counterparts, the E 400d offered a more relaxed and efficient driving experience, making it well-suited for long-distance journeys. However, some critics noted that the diesel engine lacked the sporty character of the gasoline engines. In terms of reliability, the OM 656 engine has proven to be robust and dependable, although diesel engines generally require more diligent maintenance than gasoline engines.

Legacy

The Mercedes-Benz E 400d 4MATIC Cabriolet (A238) represents a high point in the evolution of the E-Class Cabriolet. The OM 656 engine has established itself as a benchmark for modern diesel technology, offering a compelling combination of performance, efficiency, and refinement. On the used car market, these models hold their value well, particularly those with low mileage and a comprehensive service history. The E 400d 4MATIC remains a desirable option for buyers seeking a luxurious and capable open-top grand tourer.