2018-2020 Mercedes-Benz E-class (W213) E 400d (340 Hp) 4MATIC 9G-TRONIC

The Mercedes-Benz E 400d 4MATIC, produced from April 2018 to 2020, represents a potent diesel offering within the W213 E-Class generation. Positioned as a high-performance variant, it bridged the gap between the more mainstream E-Class models and the full-fledged AMG performance versions. This model combined a powerful inline-six diesel engine with Mercedes-Benz’s sophisticated 4MATIC all-wheel-drive system and the 9G-TRONIC nine-speed automatic transmission, aiming to deliver both exhilarating performance and refined long-distance comfort. It was primarily marketed in Europe and other regions where diesel engines remained popular, offering a compelling alternative to gasoline-powered counterparts.

Technical Specifications

Powertrain & Engine Architecture

The heart of the E 400d 4MATIC is the OM 656.929, a 2.9-liter inline-six diesel engine. This engine represented a significant advancement in Mercedes-Benz’s diesel technology, featuring a sophisticated commonrail direct injection system operating at extremely high pressures. The engine also employed a variable geometry turbocharger and intercooler to optimize performance and efficiency. A key innovation was the use of steel pistons, allowing for higher combustion pressures and increased durability. The engine produced 340 horsepower at 3600-4400 rpm and a substantial 700 Nm (516 lb-ft) of torque between 1200-3200 rpm. This broad torque curve provided strong acceleration across a wide range of engine speeds. The engine was paired exclusively with the 9G-TRONIC nine-speed automatic transmission. This transmission offered smooth and quick shifts, contributing to both performance and fuel economy. The 9G-TRONIC’s wide gear ratio spread allowed the engine to operate efficiently at highway speeds while providing ample gearing for acceleration.

Driving Characteristics

The E 400d 4MATIC delivered a markedly different driving experience compared to the base E-Class models. The abundant torque from the inline-six diesel engine provided effortless acceleration, making overtaking and merging onto highways a breeze. The 0-60 mph sprint was dispatched in around 4.7 seconds, placing it firmly in performance sedan territory. The 9G-TRONIC transmission contributed to a smooth and refined driving experience, with shifts being almost imperceptible in normal driving conditions. Compared to the gasoline-powered E 450, the E 400d offered a more relaxed and confident feel, particularly at lower engine speeds. While not as rev-happy as the gasoline engine, the diesel’s strong low-end torque made it ideal for everyday driving and long-distance cruising. The 4MATIC all-wheel-drive system provided excellent traction in all weather conditions, enhancing stability and control.

Equipment & Trim Levels

The E 400d 4MATIC typically came well-equipped, reflecting its position as a premium variant. Standard features often included leather upholstery, heated and ventilated front seats, a premium sound system, and a comprehensive suite of driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. Optional extras included a panoramic sunroof, a head-up display, and advanced infotainment features. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences. The dashboard layout was consistent with other W213 E-Class models, featuring a dual-screen display for the instrument cluster and infotainment system.

Chassis & Braking

The E 400d 4MATIC utilized a sophisticated chassis design featuring an independent multi-link suspension at both the front and rear. This suspension setup provided a comfortable ride while maintaining good handling characteristics. The suspension was tuned to balance comfort and control, offering a composed ride even on uneven road surfaces. Braking duties were handled by ventilated discs at all four corners, providing ample stopping power. The E 400d 4MATIC also incorporated ABS (Anti-lock Braking System), electronic stability control, and other advanced braking technologies to enhance safety.

Market Reception & Comparison

The E 400d 4MATIC was generally well-received by automotive critics. It was praised for its powerful engine, smooth transmission, comfortable ride, and refined interior. Critics noted that the diesel engine offered a compelling alternative to the gasoline engines, particularly for drivers who prioritized fuel economy and low-end torque. Compared to the E 350d, the E 400d offered a significant power upgrade, resulting in noticeably quicker acceleration. However, the E 400d was more expensive than the E 350d, making it a less accessible option for some buyers. Fuel economy was a strong point, with combined figures around 4.8 l/100 km (49 US mpg), making it an efficient choice for long-distance travel.

Legacy

The OM 656 engine family, including the version used in the E 400d, has proven to be remarkably reliable. While diesel engines generally require diligent maintenance, these engines have demonstrated a robust design and build quality. On the used car market, the E 400d 4MATIC holds its value well, attracting buyers who appreciate its performance, efficiency, and refinement. The combination of a powerful diesel engine, a sophisticated transmission, and all-wheel drive makes it a desirable option for those seeking a comfortable and capable luxury sedan. The E 400d 4MATIC represents a high point in Mercedes-Benz’s diesel technology, offering a compelling blend of performance, efficiency, and luxury.