2018-2020 Mercedes-Benz E-class Cabrio (A238) E 350d (286 Hp) 9G-TRONIC

The Mercedes-Benz E-Class Cabriolet (A238) E 350d 9G-TRONIC, produced from 2018 to 2020, represents a sophisticated blend of luxury, performance, and fuel efficiency within the E-Class range. This variant occupied a mid-to-upper position in the Cabriolet lineup, offering a compelling alternative to the gasoline-powered models and the more performance-focused AMG variants. It was primarily marketed towards buyers seeking a refined open-top experience with strong torque and respectable fuel economy, appealing to both European and North American markets, though with differing sales volumes. The A238 generation marked a significant step forward in design and technology for the E-Class Cabriolet, building upon the success of its predecessors.

Technical Specifications

INTRODUCTION

The A238 E-Class Cabriolet E 350d, launched in 2018, represented the fifth generation of Mercedes-Benz’s popular open-top offering. Built on the W213 E-Class platform, it combined the luxurious appointments expected of a Mercedes-Benz with the thrill of open-air motoring. The E 350d variant, powered by the advanced OM 656 diesel engine and paired with the 9G-TRONIC automatic transmission, was designed to deliver a refined driving experience with strong performance and improved fuel efficiency compared to earlier models. This model aimed to appeal to customers who desired a premium convertible without sacrificing practicality or running costs.

Powertrain & Engine Architecture

At the heart of the E 350d Cabriolet lies the OM 656 D 29 R SCR, a 2.9-liter inline-six cylinder diesel engine. This engine marked a significant departure from the previous V6 diesel offerings, utilizing a modular design and advanced technologies. Key features include a stepped combustion process, on-demand two-stage turbocharging, and a NANOSLIDE cylinder coating to reduce friction. The engine produces 286 horsepower and a substantial 600 Nm (442.54 lb.-ft.) of torque between 1200 and 3200 rpm. Fuel is delivered via a commonrail direct injection system operating at extremely high pressures. The 9G-TRONIC nine-speed automatic transmission is specifically tuned to complement the engine’s characteristics, providing smooth and efficient gear changes. This transmission features a wide gear ratio spread, optimizing both acceleration and fuel economy.

Driving Characteristics

The E 350d Cabriolet delivers a refined and comfortable driving experience. The high torque output of the OM 656 engine provides effortless acceleration, making overtaking maneuvers easy and confident. While not a sports car, the E 350d offers a respectable 0-60 mph time of around 5.7 seconds. The 9G-TRONIC transmission contributes to a smooth ride, seamlessly shifting gears to maintain optimal engine speed. Compared to the gasoline-powered E 450 Cabriolet, the E 350d prioritizes torque and fuel efficiency over outright horsepower. The lower center of gravity, thanks to the inline-six engine, contributes to improved handling compared to the sedan counterpart. The Cabriolet’s suspension is tuned for comfort, absorbing bumps and imperfections in the road while maintaining a stable and controlled feel.

Equipment & Trim Levels

The E 350d Cabriolet came standard with a comprehensive array of features, reflecting its premium positioning. Standard equipment typically included leather upholstery, heated and electrically adjustable front seats, a premium sound system, and Mercedes-Benz’s MBUX infotainment system with a large touchscreen display. The A238 also featured the AIRCAP system, which reduces turbulence in the cabin at higher speeds, and AIRSCARF, which provides warm air around the necks of occupants. Optional extras included advanced driver-assistance systems such as adaptive cruise control, lane-keeping assist, and a head-up display. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences.

Chassis & Braking

The A238 E-Class Cabriolet utilizes a robust chassis designed to provide both rigidity and comfort. The front suspension features an independent multi-link setup, while the rear also employs an independent multi-link design. This configuration ensures a smooth and controlled ride. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, enhancing safety and stability. The Cabriolet’s steering system is precise and responsive, offering a good balance between feedback and ease of use.

Market Reception & Comparison

The E 350d Cabriolet was generally well-received by automotive critics, who praised its refined driving experience, comfortable interior, and fuel efficiency. It was often positioned as a sensible alternative to the more expensive and less economical gasoline-powered models. Compared to the E 450 Cabriolet, the E 350d offered superior fuel economy and a broader torque curve, making it more suitable for long-distance driving. However, the E 450 provided more outright power and a slightly more engaging driving experience. The diesel variant also faced competition from other premium convertibles, such as the BMW 4 Series Convertible and the Audi A5 Cabriolet.

Legacy

The OM 656 engine, featured in the E 350d Cabriolet, has proven to be a reliable and durable powertrain. While diesel engines have faced increasing scrutiny in recent years, the OM 656’s advanced technology and efficient design have helped it meet stringent emissions standards. On the used car market, the A238 E 350d Cabriolet remains a desirable option for buyers seeking a luxurious and fuel-efficient convertible. Its combination of comfort, performance, and technology ensures its continued appeal for years to come. Regular maintenance, including adherence to Mercedes-Benz’s recommended service intervals, is crucial for maintaining the long-term reliability of this vehicle.