The Mercedes-Benz S 350 BlueTEC 4MATIC, produced between 2013 and 2016, was a diesel-powered variant of the W222 generation S-Class. Positioned as a mid-range offering within the S-Class lineup, it provided a balance between luxury, performance, and fuel efficiency. This model aimed to appeal to buyers seeking the prestige and comfort of an S-Class without the higher price tag and performance focus of the S 550 or AMG models. It utilized a sophisticated diesel engine paired with a seven-speed automatic transmission and Mercedes-Benz’s 4MATIC all-wheel-drive system, making it a capable and refined grand tourer.
Powertrain & Engine Architecture
The S 350 BlueTEC 4MATIC was powered by the OM642.861 3.0-liter V6 diesel engine. This engine, a mainstay in the Mercedes-Benz lineup for several years, featured a robust cast iron block and aluminum cylinder heads. It employed a sophisticated commonrail direct fuel injection system, delivering fuel at extremely high pressures to optimize combustion efficiency and reduce emissions. The engine also incorporated a variable geometry turbocharger with an intercooler, enhancing both low-end torque and overall power output. The engine produced 258 horsepower at 3600 rpm and a substantial 620 Nm (457.29 lb-ft) of torque between 1600 and 2400 rpm.
The engine’s valvetrain utilized three valves per cylinder (two intake, one exhaust), contributing to improved breathing and efficiency. A particulate filter was standard equipment, helping to minimize soot emissions and meet stringent Euro 6 emission standards. The engine had a compression ratio of 15.5:1, typical for a modern diesel engine designed for efficiency and power.
The engine was mated to Mercedes-Benz’s 7G-TRONIC PLUS seven-speed automatic transmission. This transmission was known for its smooth and responsive shifts, contributing to a refined driving experience. The 7G-TRONIC PLUS featured a torque converter lock-up clutch that engaged in most driving situations, improving fuel economy. The transmission offered selectable driving modes, allowing the driver to tailor the shift points to their preferences or driving conditions.
Engine Specifications
Engine Code: OM 642.861
Displacement: 2987 cm3 (182.28 cu. in.)
Configuration: V6
Aspiration: Turbocharged, Intercooled
Driving Characteristics
The S 350 BlueTEC 4MATIC offered a distinctly different driving experience compared to its gasoline-powered siblings. While lacking the outright acceleration of the S 550, the diesel engine’s abundant torque provided strong and effortless acceleration in everyday driving situations. The 0-60 mph sprint was achieved in approximately 6.5 seconds, and 0-100 km/h in 6.8 seconds, making it a surprisingly quick vehicle for its size and weight. The 7G-TRONIC transmission contributed to smooth and seamless gear changes, enhancing the overall driving experience.
The 4MATIC all-wheel-drive system provided excellent traction in all weather conditions, enhancing stability and confidence. The gear ratios were optimized for both fuel efficiency and responsive acceleration. First gear was relatively short, providing strong off-the-line acceleration, while higher gears were geared for comfortable highway cruising. The suspension, tuned for comfort, absorbed bumps and imperfections in the road effectively, providing a smooth and refined ride. Compared to the more performance-oriented S-Class models, the S 350 BlueTEC prioritized comfort and refinement over outright sportiness.
Equipment & Trim Levels
The S 350 BlueTEC 4MATIC came standard with a comprehensive array of luxury features. Standard interior appointments included high-quality leather upholstery, wood trim, and a multi-function steering wheel. The infotainment system featured a large central display screen, controlled by a rotary dial and touchpad. Standard safety features included a suite of driver-assistance systems, such as automatic emergency braking, lane-keeping assist, and blind-spot monitoring.
Optional extras included features such as a panoramic sunroof, premium Burmester audio system, massaging seats, and a rear-seat entertainment system. The S 350 BlueTEC was typically offered with a relatively limited number of option packages, focusing on enhancing either comfort or technology. Interior color choices were extensive, allowing buyers to personalize their vehicle to their tastes. Dashboard configurations were consistent across the S-Class range, with a focus on elegant design and intuitive functionality.
Chassis & Braking
The W222 S-Class chassis featured an independent multi-link suspension at both the front and rear axles. This suspension design provided a comfortable ride and excellent handling characteristics. The S 350 BlueTEC, being a heavier vehicle due to the diesel engine and all-wheel-drive system, utilized slightly stiffer spring rates and dampers compared to some of the lighter S-Class models.
The braking system consisted of ventilated discs at all four corners. The anti-lock braking system (ABS) and electronic stability control (ESC) were standard features, enhancing safety and control. The steering system was a rack-and-pinion setup with electric power steering, providing precise and responsive steering feel. Tire size was typically 245/55 R17, mounted on 17-inch alloy wheels.
Market Reception & Comparison
The S 350 BlueTEC 4MATIC was generally well-received by automotive critics. It was praised for its refined driving experience, comfortable ride, and excellent fuel economy. Fuel consumption figures ranged from 5.9-6.4 l/100 km (39.9-36.8 US mpg), making it significantly more fuel-efficient than the gasoline-powered S 550. However, some critics noted that the diesel engine lacked the refinement and responsiveness of the gasoline engines.
Compared to the S 550, the S 350 BlueTEC offered a more affordable entry point into the S-Class range. It also provided better fuel economy and a more relaxed driving experience. Compared to other diesel-powered luxury sedans, such as the BMW 730d and Audi A8 3.0 TDI, the S 350 BlueTEC was considered to be a competitive offering, offering a similar level of luxury and performance. Reliability was generally good, although diesel engines can be more complex and potentially more expensive to maintain than gasoline engines.
Technical Specifications
| Body Type | Sedan, 4 Doors, 4-5 Seats |
| Fuel Economy (Combined) | 5.9-6.4 l/100 km (39.9 – 36.8 US mpg) |
| CO2 Emissions | 156-168 g/km |
| Maximum Speed | 250 km/h (155.34 mph) |
| Acceleration 0-100 km/h | 6.8 sec |
| Engine Displacement | 2987 cm3 (182.28 cu. in.) |
| Number of Cylinders | 6 |
| Engine Configuration | V-engine |
| Fuel Injection System | Diesel Commonrail |
| Engine Oil Capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant Capacity | 11.6 l (12.26 US qt | 10.21 UK qt) |
| Kerb Weight | 1950 kg (4299.01 lbs.) |
| Max. Weight | 2715 kg (5985.55 lbs.) |
| Trunk Space (Minimum) | 510 l (18.01 cu. ft.) |
| Fuel Tank Capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Transmission | 7-speed automatic (7G-TRONIC PLUS) |
| Drive Type | All-wheel drive (4MATIC) |
| Front Suspension | Independent multi-link |
| Rear Suspension | Independent multi-link |
| Front Brakes | Ventilated discs |
| Rear Brakes | Ventilated discs |
Legacy
The OM642 diesel engine, as used in the S 350 BlueTEC, has proven to be a durable and reliable powertrain when properly maintained. While diesel engines generally require more diligent maintenance than gasoline engines (particularly regarding oil changes and fuel filter replacements), they are capable of high mileage. In the used car market, the W222 S 350 BlueTEC 4MATIC represents a compelling value proposition. It offers the luxury and prestige of an S-Class at a more affordable price point than its gasoline-powered counterparts. However, potential buyers should be aware of the potential for higher maintenance costs associated with a diesel engine and the importance of verifying the vehicle’s service history. The S 350 BlueTEC remains a popular choice for buyers seeking a comfortable, refined, and fuel-efficient luxury sedan.
