2018-2020 Mercedes-Benz E-class Cabrio (A238) E 300d (245 Hp) 9G-TRONIC

The Mercedes-Benz E-Class Cabriolet (A238) E 300d, produced from May 2018 to 2020, represents a sophisticated blend of luxury, performance, and efficiency within the E-Class range. Positioned as a mid-range offering in the Cabriolet lineup, it catered to buyers seeking a refined open-top experience with a diesel powertrain. This variant utilized a 2.0-liter turbocharged diesel engine paired with a 9G-TRONIC automatic transmission, offering a balance between spirited driving and fuel economy. The A238 generation marked a significant evolution in design and technology for the E-Class Cabriolet, building upon the success of its predecessors while incorporating modern features and a more dynamic driving experience.

Technical Specifications

Powertrain & Engine Architecture

The heart of the E 300d Cabriolet is the OM 654.920, a 2.0-liter inline-four cylinder diesel engine. This engine is a member of Mercedes-Benz’s modular engine family, known for its lightweight construction and advanced technology. It features a steel crankshaft, aluminum engine block, and variable valve timing (VVT) on both intake and exhaust sides. The engine utilizes a two-stage turbocharging system with a variable turbine geometry (VTG) turbocharger, enhancing both low-end torque and high-end power. Fuel is delivered via a common-rail direct injection system operating at extremely high pressures (up to 2,700 bar) for optimized combustion. The 9G-TRONIC nine-speed automatic transmission is integral to the powertrain, offering smooth and efficient gear changes. This transmission features a wide gear ratio spread, contributing to both fuel economy and responsive acceleration. The transmission is electronically controlled and adapts to driving conditions and driver input.

Driving Characteristics

The E 300d Cabriolet delivers a refined and comfortable driving experience. The 500 Nm (368 lb-ft) of torque available from 1600-2400 rpm provides ample power for effortless cruising and confident overtaking. While not as overtly sporty as some of the gasoline-powered E-Class variants, the diesel engine offers strong low-end and mid-range acceleration. The 9G-TRONIC transmission contributes to smooth transitions between gears, minimizing disruptions to the driving experience. Compared to the more powerful E 450 Cabriolet, the E 300d prioritizes fuel efficiency and relaxed cruising. The gear ratios are tuned for optimal fuel economy, and the engine operates quietly and smoothly at highway speeds. The rear-wheel drive configuration provides a balanced feel, although it may not offer the same level of grip as all-wheel drive models in challenging conditions.

Equipment & Trim Levels

The E 300d Cabriolet came standard with a comprehensive array of features, reflecting its positioning as a premium vehicle. Standard equipment typically included leather upholstery, automatic climate control, a high-resolution infotainment system with navigation, and a suite of driver-assistance systems such as adaptive cruise control and lane-keeping assist. Optional extras included features like a premium Burmester sound system, ventilated and massaging front seats, and a head-up display. Interior trim options allowed for personalization, with a range of wood veneers, aluminum accents, and upholstery colors available. The Cabriolet’s soft top was a multi-layer acoustic fabric top designed to provide a quiet and comfortable cabin experience even at high speeds.

Chassis & Braking

The A238 E-Class Cabriolet utilizes a sophisticated chassis design focused on comfort and handling. The front suspension features a four-link independent setup, while the rear employs a multi-link independent suspension. This configuration provides a smooth ride and precise handling characteristics. The E 300d typically featured disc brakes on all four wheels, with ventilated front discs for improved heat dissipation. Anti-lock braking system (ABS) and electronic stability control (ESC) were standard features, enhancing safety and control. The steering system is a rack-and-pinion setup with electric power assistance, providing precise and responsive steering feel.

Market Reception & Comparison

The E 300d Cabriolet was generally well-received by automotive critics, who praised its refined driving experience, fuel efficiency, and luxurious interior. It was often seen as a sensible alternative to the more expensive and performance-oriented E 450 Cabriolet. Fuel economy was a key selling point, with the diesel engine offering significantly better mileage than its gasoline counterpart. Reliability was generally good, although diesel engines can be more complex than gasoline engines and may require more specialized maintenance. Compared to other premium cabriolets in its class, such as the BMW 4 Series Convertible and Audi A5 Cabriolet, the E-Class offered a compelling combination of luxury, technology, and fuel efficiency.

Legacy

The OM 654 engine family has proven to be a robust and reliable powerplant, and the E 300d Cabriolet is no exception. While modern diesel technology has faced increased scrutiny, these engines, when properly maintained, are capable of high mileage and long-term durability. On the used car market, the A238 E 300d Cabriolet remains a desirable option for buyers seeking a luxurious and fuel-efficient open-top experience. Its combination of comfort, technology, and performance continues to appeal to a wide range of drivers. The 9G-TRONIC transmission has also proven to be a reliable unit, contributing to the overall longevity of the vehicle.