The Mercedes-Benz S 350 CDI BlueEFFICIENCY 4MATIC, produced between 2009 and 2010, represented a compelling blend of luxury, performance, and fuel efficiency within the V221 S-Class Long wheelbase generation. Positioned as a mid-range offering in the S-Class lineup, it catered to buyers seeking the prestige and comfort of the flagship sedan with the added benefit of a diesel powertrain and all-wheel drive. This variant was part of the facelifted V221 series, incorporating styling and technological updates introduced in 2009. It aimed to provide a refined driving experience while minimizing running costs, a key consideration in European markets where diesel engines held significant popularity.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-Class |
| Generation | S-Class Long (V221, facelift 2009) |
| Type | S 350 CDI BlueEFFICIENCY (235 Hp) 4MATIC G-TRONIC |
| Start of production | 2009 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 10.7-10.9 l/100 km (22 – 21.6 US mpg) |
| Fuel consumption (extra urban) | 6.2-6.3 l/100 km (37.9 – 37.3 US mpg) |
| Fuel consumption (combined) | 7.8-8.0 l/100 km (30.2 – 29.4 US mpg) |
| CO2 emissions | 207-211 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.8 sec |
| Acceleration 0 – 62 mph | 7.8 sec |
| Acceleration 0 – 60 mph | 7.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 8.5 kg/Hp |
| Weight-to-torque ratio | 3.7 kg/Nm |
| Power | 235 Hp @ 3600 rpm |
| Torque | 540 Nm @ 1600-2400 rpm (398.28 lb.-ft. @ 1600-2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.930 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Compression ratio | 17.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 1995 kg (4398.22 lbs.) |
| Max. weight | 2655 kg (5853.27 lbs.) |
| Max load | 660 kg (1455.05 lbs.) |
| Trunk (boot) space (minimum) | 560 l (19.78 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Length | 5226 mm (205.75 in.) |
| Width | 1871 mm (73.66 in.) |
| Width including mirrors | 2120 mm (83.46 in.) |
| Height | 1479 mm (58.23 in.) |
| Wheelbase | 3165 mm (124.61 in.) |
| Front track | 1600 mm (62.99 in.) |
| Rear track | 1606 mm (63.23 in.) |
| Front overhang | 888 mm (34.96 in.) |
| Rear overhang | 1173 mm (46.18 in.) |
| Minimum turning circle | 12.2 m (40.03 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 235/55 R17 |
| Wheel rims size | 17 |
INTRODUCTION
The S 350 CDI BlueEFFICIENCY 4MATIC, launched in 2009 as part of the V221 S-Class facelift, offered a compelling alternative to the gasoline-powered variants. The V221 generation (2005-2013) represented a significant leap forward in Mercedes-Benz technology and luxury. The facelift brought revised styling, improved efficiency, and updated driver assistance systems. The “BlueEFFICIENCY” designation indicated Mercedes-Benz’s efforts to reduce fuel consumption and emissions through various technologies. The 4MATIC all-wheel-drive system provided enhanced traction and stability, particularly valuable in inclement weather conditions. This model was primarily aimed at the European market, where diesel engines were favored for their fuel economy and torque characteristics, but was also available in other regions.
Powertrain & Engine Architecture
At the heart of the S 350 CDI BlueEFFICIENCY lay the OM 642.930 3.0-liter V6 diesel engine. This engine was a sophisticated design featuring a common rail direct injection system, a variable geometry turbocharger, and an intercooler. The common rail system allowed for precise control of fuel delivery, optimizing combustion efficiency and reducing emissions. The turbocharger boosted power output, providing strong acceleration, while the intercooler cooled the intake air, further enhancing performance. The engine produced 235 horsepower at 3600 rpm and a substantial 540 Nm (398 lb-ft) of torque between 1600 and 2400 rpm. This torque curve provided effortless cruising and strong passing power. The engine also featured a diesel particulate filter (DPF) and a selective catalytic reduction (SCR) system with AdBlue injection to minimize harmful emissions. The engine was paired with Mercedes-Benz’s 7G-TRONIC seven-speed automatic transmission, known for its smooth and responsive shifts. This transmission was electronically controlled and adapted to the driver’s style and driving conditions.
Driving Characteristics
The S 350 CDI BlueEFFICIENCY 4MATIC offered a refined and comfortable driving experience. The abundant torque from the diesel engine provided strong acceleration, even with the added weight of the long wheelbase and all-wheel-drive system. While not as overtly sporty as the V8-powered S-Class models, the S 350 CDI offered more than adequate performance for most drivers. The 7G-TRONIC transmission contributed to the smooth and seamless power delivery. The 4MATIC all-wheel-drive system provided excellent traction and stability, particularly on slippery surfaces. The long wheelbase contributed to a comfortable ride, absorbing bumps and imperfections in the road. Compared to the S 350 gasoline variant, the CDI offered significantly better fuel economy and a more relaxed driving experience, albeit with slightly less outright power. Compared to the higher-performance S 500 or S 63 AMG models, the S 350 CDI prioritized efficiency and comfort over raw speed and agility.
Equipment & Trim Levels
The S 350 CDI BlueEFFICIENCY 4MATIC came standard with a comprehensive array of luxury features. These included leather upholstery, wood trim, automatic climate control, a premium sound system, and a host of safety features such as ABS, ESP, and multiple airbags. The S-Class was renowned for its advanced technology, and this variant included features such as a COMAND infotainment system with navigation, parking sensors, and rain-sensing wipers. Optional extras included features such as a panoramic sunroof, adaptive cruise control, massaging seats, and a rear-seat entertainment system. The interior design was characterized by its elegant and understated luxury, with high-quality materials and meticulous attention to detail.
Chassis & Braking
The S 350 CDI BlueEFFICIENCY 4MATIC featured a sophisticated chassis designed to provide a comfortable and controlled ride. The suspension system consisted of independent multi-link suspension at all four corners, with air suspension available as an option. The air suspension allowed for adjustable ride height and damping, further enhancing comfort and handling. The braking system consisted of disc brakes on all four wheels, with ABS and ESP providing enhanced safety. The 4MATIC all-wheel-drive system distributed power between the front and rear axles as needed, optimizing traction and stability. The steering system was a rack-and-pinion setup with power assistance, providing precise and responsive steering feel.
Market Reception & Comparison
The S 350 CDI BlueEFFICIENCY 4MATIC was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and luxurious interior. The diesel engine was noted for its strong torque and refined operation. However, some critics found the performance to be slightly underwhelming compared to the gasoline-powered S-Class models. In terms of fuel economy, the S 350 CDI significantly outperformed the S 350 gasoline variant, offering a substantial cost savings for drivers who covered long distances. Reliability was generally good, although diesel engines can be more complex than gasoline engines and may require more specialized maintenance.
Legacy
The Mercedes-Benz S 350 CDI BlueEFFICIENCY 4MATIC remains a desirable used car today, particularly for buyers seeking a luxurious and fuel-efficient grand tourer. The OM 642 diesel engine is known for its durability and longevity, provided it has been properly maintained. However, potential buyers should be aware of the potential maintenance costs associated with diesel engines, such as DPF regeneration and AdBlue refills. The V221 S-Class, in general, is considered a technologically advanced and well-built vehicle, and the S 350 CDI 4MATIC represents a compelling value proposition in the used car market.
