The Mercedes-Benz S 350d 4MATIC, produced between 2016 and 2017, was a diesel-powered variant of the W222 generation S-Class. Positioned as a mid-range offering within the S-Class lineup, it aimed to provide a balance between performance, fuel efficiency, and luxury. This model served as an alternative to the more powerful S 500 and the technologically advanced S 550e plug-in hybrid, while offering a more economical option than the gasoline-powered counterparts. The S 350d 4MATIC was built on the 1HX0 platform, shared with other high-end Mercedes-Benz vehicles.
Powertrain & Engine Architecture
The heart of the S 350d 4MATIC is the OM 642.867 3.0-liter V6 diesel engine. This engine is a longitudinally mounted, turbocharged common rail diesel, representing a significant evolution in Mercedes-Benz’s diesel technology. It features a single turbocharger with an intercooler, boosting power and efficiency. The engine utilizes a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, optimizing gas flow for improved combustion. The common rail direct fuel injection system operates at extremely high pressures, ensuring precise fuel delivery and contributing to reduced emissions.
The engine is paired with Mercedes-Benz’s 9G-TRONIC nine-speed automatic transmission. This transmission is known for its smooth shifting and wide gear ratio spread, contributing to both fuel economy and performance. The 9G-TRONIC allows the engine to operate within its optimal efficiency range more frequently. The transmission features a torque converter and fully automatic electronic control, adapting shift points based on driving conditions and driver input. The 4MATIC all-wheel-drive system distributes power between the front and rear axles, enhancing traction and stability, particularly in adverse weather conditions.
Engine Specifications
Key engine specifications include a compression ratio of 18:1, a cylinder bore of 83mm, and a piston stroke of 92mm. The engine produces 258 horsepower at 3400 rpm and a substantial 620 Nm (457.29 lb-ft) of torque between 1600 and 2400 rpm. This broad torque curve provides strong acceleration and effortless cruising. The engine also incorporates a Start & Stop system and a particulate filter to minimize emissions, complying with Euro 6 emission standards.
Driving Characteristics
The S 350d 4MATIC delivers a refined and comfortable driving experience. While not as overtly powerful as the higher-spec S-Class models, the 3.0-liter diesel provides ample power for everyday driving and confident highway passing. The 9G-TRONIC transmission contributes to smooth and seamless gear changes, minimizing disruptions to the driving experience. The all-wheel-drive system provides excellent grip and stability, inspiring confidence in various driving conditions.
Acceleration from 0 to 100 km/h (0-62 mph) takes approximately 6.5 seconds, and 0-60 mph is achieved in around 6.2 seconds. The electronically limited top speed is 250 km/h (155.34 mph). The wide gear ratio spread of the 9G-TRONIC allows for relaxed cruising at highway speeds, with the engine operating at low revolutions. The torque delivery is particularly noteworthy, providing strong pull from low engine speeds, making overtaking maneuvers effortless. Compared to the S 500, the S 350d offers a more relaxed and fuel-efficient driving experience, while the manual transmission options available on other S-Class models provide a more engaging, driver-focused experience.
Equipment & Trim Levels
The S 350d 4MATIC came standard with a high level of equipment, befitting its status as a flagship luxury sedan. Standard features typically included leather upholstery, heated and ventilated front seats with massage functions, a premium sound system, a large infotainment display with navigation, and a comprehensive suite of safety features. These safety features included adaptive cruise control, lane keeping assist, blind spot monitoring, and automatic emergency braking.
Optional extras included features such as a panoramic sunroof, rear seat entertainment, upgraded leather options, and various driver assistance packages. The interior dashboard configuration was consistent with other W222 S-Class models, featuring a dual-screen display and high-quality materials throughout. Trim levels were often differentiated by the availability of optional packages and cosmetic enhancements, such as different wheel designs and interior trim finishes.
Chassis & Braking
The S 350d 4MATIC utilizes an air suspension system on both the front and rear axles. This air suspension provides a remarkably smooth and comfortable ride, automatically adjusting to road conditions and load variations. The suspension system also allows for adjustable ride height, enhancing comfort and practicality. 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 control. The steering system is a power-assisted rack and pinion system, providing precise and responsive steering feel.
The vehicle is equipped with 245/55 R17 tires mounted on 8J x 17 inch wheel rims. The chassis is designed to minimize noise, vibration, and harshness (NVH), contributing to the S-Class’s renowned refinement. The weight distribution is carefully balanced to optimize handling and stability.
Market Reception & Comparison
The S 350d 4MATIC was generally well-received by automotive critics. It was praised for its comfortable ride, refined interior, and fuel efficiency. The diesel engine was noted for its quiet operation and strong torque delivery. Critics also appreciated the smooth shifting of the 9G-TRONIC transmission and the added security of the 4MATIC all-wheel-drive system.
Compared to the S 500, the S 350d offered a more economical option without sacrificing a significant amount of performance or luxury. Fuel economy figures ranged from 5.7 to 6.4 l/100 km (41.3 to 36.8 US mpg), making it a more attractive option for drivers who prioritize fuel efficiency. In terms of reliability, the OM 642 engine family has a generally good reputation, although diesel engines can be more susceptible to issues related to the fuel injection system and particulate filter. Compared to the S 550e plug-in hybrid, the S 350d offered a simpler and more conventional powertrain, potentially reducing the risk of complex hybrid system failures.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-Class |
| Generation | S-Class (W222) |
| Type | S 350d (258 Hp) 4MATIC 9G-TRONIC |
| Start of production | 2016 |
| End of production | 2017 |
| Fuel consumption (urban) | 6.8-7.4 l/100 km (34.6 – 31.8 US mpg) |
| Fuel consumption (extra urban) | 5.1-5.8 l/100 km (46.1 – 40.6 US mpg) |
| Fuel consumption (combined) | 5.7-6.4 l/100 km (41.3 – 36.8 US mpg) |
| CO2 emissions | 149-169 g/km |
| Fuel Type | Diesel |
| Acceleration 0-100 km/h | 6.5 sec |
| Acceleration 0-62 mph | 6.5 sec |
| Acceleration 0-60 mph | 6.2 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Engine Model/Code | OM 642.867 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Power | 258 Hp @ 3400 rpm |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft. @ 1600-2400 rpm) |
| Kerb Weight | 1950 kg (4299.01 lbs.) |
| Max. weight | 2725 kg (6007.6 lbs.) |
| Trunk (boot) space | 510 l (18.01 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal) |
| Number of gears | 9 |
| Gearbox type | Automatic transmission G-TRONIC |
Legacy
The S 350d 4MATIC, while only produced for a short period, remains a desirable option in the used car market. The OM 642 engine is known for its durability and longevity, provided it has been properly maintained. Regular servicing, including oil changes and fuel filter replacements, is crucial for ensuring the engine’s continued reliability. The 9G-TRONIC transmission has also proven to be a reliable unit. However, potential buyers should be aware of the potential for issues with the diesel particulate filter (DPF), particularly if the vehicle has been primarily used for short journeys. Overall, the S 350d 4MATIC represents a compelling combination of luxury, performance, and fuel efficiency, making it a popular choice for discerning buyers seeking a high-end diesel sedan.
