2020-2023 Mercedes-Benz S-class Long (V223) S 350d (286 Hp) 4MATIC 9G-TRONIC

The Mercedes-Benz S-Class Long (V223) S 350d 4MATIC, produced from 2020 to April 2023, represents a significant iteration of the flagship S-Class sedan. This variant, distinguished by its extended wheelbase (“Long” designation) and powerful diesel engine, was primarily aimed at markets where rear passenger space and refined long-distance cruising were highly valued. It slots into the S-Class range as a performance and efficiency-focused option, positioned between the entry-level S 320d and the more potent S 450d or petrol-powered S 580 models. The V223 generation marked a substantial leap forward in technology, interior luxury, and driver assistance systems, continuing the S-Class’s tradition of innovation.

Technical Specifications

Powertrain & Engine Architecture

The S 350d 4MATIC is powered by the OM 656.929, a 2.9-liter inline-six cylinder diesel engine. This engine is a cornerstone of Mercedes-Benz’s modern diesel strategy, known for its refined operation and high efficiency. It utilizes a sophisticated diesel commonrail fuel injection system, delivering fuel at extremely high pressures for optimized combustion. The engine employs a bi-turbocharger setup – a small turbocharger for quick response at low engine speeds and a larger turbocharger for increased power at higher RPMs. An intercooler further enhances performance by cooling the compressed intake air. The engine produces 286 horsepower at 3400-4600 rpm and a substantial 600 Nm (442 lb-ft) of torque between 1200-3200 rpm. This broad torque curve is a key characteristic of the engine, providing strong acceleration in real-world driving conditions. The engine is paired with Mercedes-Benz’s 9G-TRONIC nine-speed automatic transmission. This transmission is designed for smooth and efficient gear changes, contributing to both performance and fuel economy. The 9G-TRONIC features a wide gear ratio spread, allowing the engine to operate in its most efficient range more often.

Driving Characteristics

The S 350d 4MATIC delivers a driving experience focused on effortless power and refined comfort. The abundant low-end torque from the inline-six diesel engine provides strong acceleration from a standstill and makes overtaking easy. While not as overtly sporty as some of the higher-powered S-Class variants, the S 350d offers more than adequate performance for most drivers, achieving 0-60 mph in around 5.9 seconds. The 9G-TRONIC transmission contributes to a smooth and seamless driving experience, with gear changes being almost imperceptible. The long wheelbase of the S-Class provides a stable and comfortable ride, even on uneven road surfaces. The 4MATIC all-wheel-drive system enhances traction and stability, particularly in adverse weather conditions. Compared to the S 450d, the S 350d offers a slightly less aggressive driving experience, prioritizing fuel efficiency and relaxed cruising over outright performance.

Equipment & Trim Levels

The S 350d 4MATIC Long typically came well-equipped as standard, reflecting the S-Class’s position as a luxury flagship. Standard features included leather upholstery, heated and ventilated front seats with massage functions, a Burmester surround sound system, a large touchscreen infotainment system with MBUX (Mercedes-Benz User Experience), and a comprehensive suite of driver assistance systems, including adaptive cruise control, lane keeping assist, and automatic emergency braking. The extended wheelbase provided significantly more rear legroom compared to the standard-wheelbase S-Class. Optional extras included rear-seat entertainment systems, premium leather options, a panoramic sunroof, and various customization options through Mercedes-Benz’s designo program.

Chassis & Braking

The V223 S-Class utilizes an advanced chassis design featuring an independent multi-link suspension at both the front and rear. Air suspension is standard, providing a supremely comfortable ride and the ability to adjust the ride height. The S 350d 4MATIC is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The electronic stability program (ESP) and anti-lock braking system (ABS) are standard features, enhancing safety and control. Available options included rear-axle steering, which further enhances maneuverability at low speeds and stability at high speeds.

Market Reception & Comparison

The S 350d 4MATIC Long was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, luxurious interior, and advanced technology. Critics noted that the diesel engine offered a good balance of performance and fuel economy, making it a practical choice for long-distance drivers. Compared to the petrol-powered S-Class variants, the S 350d offered significantly better fuel economy. Compared to the S 450d, it provided a slightly more relaxed driving experience and a lower price point. However, some critics noted that the diesel engine was not as refined or responsive as the petrol engines.

Legacy

The OM 656 engine family, including the version used in the S 350d, has proven to be a reliable and durable powertrain. While modern diesel engines are complex systems, the OM 656 has generally demonstrated good long-term reliability. On the used car market, the V223 S 350d 4MATIC Long holds its value well, reflecting the S-Class’s reputation for luxury and prestige. Maintenance costs can be higher than for more mainstream vehicles, but the S-Class’s build quality and advanced technology continue to appeal to discerning buyers seeking a refined and comfortable luxury sedan.