2017-2018 Mercedes-Benz E-class Cabrio (A238) E 350d (258 Hp) 4MATIC 9G-TRONIC

Technical Specifications

The Mercedes-Benz E-Class Cabriolet (A238) E 350d 4MATIC, produced from June 2017 to May 2018, represented a compelling blend of luxury, performance, and efficiency within the E-Class convertible range. Positioned as a mid-to-upper tier offering, it catered to buyers seeking a refined open-air driving experience coupled with the robust power of a diesel engine and the security of all-wheel drive. This variant occupied a space between the entry-level E 200d and the more potent E 400d, offering a balance of cost and capability. It was built on the W238 platform, the fifth generation of the E-Class Cabriolet.

Powertrain & Engine Architecture

The E 350d Cabriolet was powered by the OM 642.873, a 3.0-liter turbocharged V6 diesel engine. This engine was a mainstay in Mercedes-Benz’s lineup, known for its robust construction and refined power delivery. It featured a common-rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. The engine also incorporated a variable geometry turbocharger and intercooler to enhance performance and efficiency. The engine produced 258 horsepower at 3400 rpm and a substantial 620 Nm (457 lb-ft) of torque between 1600 and 2400 rpm. This torque output was a key characteristic, providing strong acceleration and effortless cruising. The engine’s 15.5:1 compression ratio was typical for a diesel engine, contributing to its thermal efficiency. The 9G-TRONIC nine-speed automatic transmission was standard, offering smooth and efficient gear changes. This transmission was designed to maximize fuel economy and provide a comfortable driving experience.

Driving Characteristics

The combination of the 3.0-liter diesel and the 9G-TRONIC transmission resulted in a refined and capable driving experience. The E 350d Cabriolet offered brisk acceleration, achieving 0-60 mph in approximately 5.8 seconds. The high torque output meant strong pull from low engine speeds, making overtaking effortless. The 9G-TRONIC transmission was well-tuned, providing seamless gear changes and contributing to a relaxed highway cruising experience. Compared to the E 200d, the E 350d offered significantly more power and torque, resulting in a more engaging driving experience. While not as sporty as the E 400d, the E 350d provided a good balance between performance and fuel economy. The 4MATIC all-wheel-drive system provided enhanced traction and stability, particularly in adverse weather conditions.

Equipment & Trim Levels

The E 350d 4MATIC Cabriolet came standard with a comprehensive list of features, reflecting its position as a mid-to-upper tier model. Standard equipment included leather upholstery, automatic climate control, a high-resolution infotainment system with navigation, and a premium sound system. Safety features such as adaptive cruise control, lane keeping assist, and automatic emergency braking were also standard. Optional extras included a head-up display, massaging seats, and a panoramic sunroof. Interior trim options included various wood and aluminum finishes, allowing buyers to personalize their vehicle. The Cabriolet’s soft top was available in several colors and could be operated at speeds up to 50 km/h (31 mph).

Chassis & Braking

The E-Class Cabriolet featured a sophisticated chassis designed to provide a comfortable and controlled ride. The suspension consisted of independent multi-link setups at both the front and rear. The E 350d was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and Electronic Stability Program (ESP) were standard safety features. The steering was a rack-and-pinion system with electric power assistance, offering precise and responsive handling. The 4MATIC all-wheel-drive system distributed power between the front and rear axles as needed, enhancing traction and stability.

Market Reception & Comparison

The E 350d 4MATIC Cabriolet was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and luxurious interior. The diesel engine was noted for its fuel efficiency and strong torque output. Compared to the E 200d, the E 350d offered a noticeable performance upgrade without sacrificing fuel economy. While the E 400d provided even more power, the E 350d represented a more sensible option for many buyers. Fuel economy figures were competitive for its class, averaging around 36 mpg in combined driving. Reliability was generally good, although diesel engines can be more complex to maintain than gasoline engines.

Legacy

The OM 642 engine family, including the OM 642.873 found in the E 350d, has a reputation for durability and longevity when properly maintained. These engines are known to be capable of high mileage with regular servicing. On the used car market, the E 350d Cabriolet remains a desirable option for buyers seeking a luxurious and capable convertible. However, potential buyers should be aware of the potential maintenance costs associated with a diesel engine, including the diesel particulate filter (DPF) and potential issues with the fuel injection system. Overall, the E 350d 4MATIC Cabriolet represents a well-engineered and refined vehicle that continues to offer a compelling driving experience.