The Mercedes-Benz S 350 CDI BlueTEC 4MATIC, part of the long-wheelbase (V221) S-Class facelift introduced in 2009, represented a compelling blend of luxury, efficiency, and performance for the American market, despite being primarily designed for European tastes. Produced from 2010 to 2013, this variant occupied a significant position in the S-Class lineup as the entry-level diesel offering, appealing to buyers prioritizing fuel economy and long-distance comfort without sacrificing the prestige associated with the S-Class nameplate. It was positioned below the S 550 models (both naturally aspirated and turbocharged) and the high-performance S 63 AMG, offering a more accessible price point while still delivering a sophisticated driving experience.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V221, facelift 2009) |
| Type (Engine) | S 350 CDI BlueTEC (258 Hp) 4MATIC G-TRONIC |
| Start of production | 2010 |
| End of production | 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 9.9-10.1 l/100 km (23.8 – 23.3 US mpg) |
| Fuel consumption (extra urban) | 5.8-5.9 l/100 km (40.6 – 39.9 US mpg) |
| Fuel consumption (combined) | 7.3-7.4 l/100 km (32.2 – 31.8 US mpg) |
| CO2 emissions | 193-195 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.1 sec |
| Acceleration 0 – 62 mph | 7.1 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8 kg/Hp, 125.5 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 301.7 Nm/tonne |
| Power | 258 Hp @ 3600 rpm |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft. @ 1600-2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.868 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Compression ratio | 15.5:1 |
| 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 | 2055 kg (4530.5 lbs) |
| Max. weight | 2710 kg (5974.53 lbs) |
| Max load | 655 kg (1444.03 lbs) |
| Trunk (boot) space – minimum | 560 l (19.78 cu. ft.) |
| Fuel tank capacity | 83 l (21.93 US gal | 18.26 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 (Back) 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 |
| Tires size | 235/55 R17 |
| Wheel rims size | 17 |
INTRODUCTION
The V221 S-Class, produced from 2005 to 2013, represented a significant leap forward in automotive technology and luxury. The 2009 facelift brought revised styling, updated safety features, and more efficient engine options. The S 350 CDI BlueTEC 4MATIC, introduced in 2010, was a key component of this update, offering a diesel-powered alternative to the gasoline engines. The “BlueTEC” designation signified the implementation of advanced emissions control technology, including a particulate filter and selective catalytic reduction (SCR) system, to meet stringent Euro 6 standards. The 4MATIC all-wheel-drive system provided enhanced traction and stability, particularly valuable in inclement weather conditions. The long-wheelbase configuration added approximately three inches to the standard S-Class, providing increased rear legroom and further enhancing the luxurious experience.
Powertrain & Engine Architecture
At the heart of the S 350 CDI BlueTEC lay the OM 642.868 3.0-liter V6 diesel engine. This engine, a mainstay of the Mercedes-Benz lineup, was renowned for its robust construction and refined operation. It featured a common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A variable geometry turbocharger with an intercooler further enhanced performance and efficiency. The engine produced 258 horsepower at 3600 rpm and a substantial 620 Nm (457 lb-ft) of torque between 1600 and 2400 rpm. This broad torque curve provided effortless acceleration and strong pulling power. The engine’s 15.5:1 compression ratio was typical for a diesel engine, contributing to its thermal efficiency. Paired with the engine was the 7G-TRONIC seven-speed automatic transmission, known for its smooth and responsive shifts. This transmission was specifically tuned to complement the characteristics of the diesel engine, optimizing fuel economy and drivability.
Driving Characteristics
The S 350 CDI BlueTEC 4MATIC offered a distinctly different driving experience compared to its gasoline-powered siblings. While lacking the outright acceleration of the S 550 models, the diesel engine’s abundant torque provided strong and readily available power throughout the rev range. The 7G-TRONIC transmission contributed to a relaxed and refined driving experience, with seamless gear changes. The 4MATIC all-wheel-drive system instilled confidence in various road conditions, providing enhanced grip and stability. The long wheelbase and sophisticated suspension system, featuring adaptive damping, ensured a comfortable and composed ride, even on uneven surfaces. The gear ratios were optimized for both fuel efficiency and effortless cruising, making it an ideal grand tourer. While not a sports car, the S 350 CDI offered a surprisingly capable and engaging driving experience for its size and weight.
Equipment & Trim Levels
The S 350 CDI BlueTEC 4MATIC came standard with a comprehensive array of luxury features. These included leather upholstery, power-adjustable heated and ventilated front seats, a premium sound system, a navigation system, and a sunroof. Standard safety features included multiple airbags, anti-lock brakes, electronic stability control, and a driver drowsiness warning system. Optional extras included a rear entertainment system, massaging seats, a panoramic sunroof, and advanced parking assist features. Interior trim options included various wood veneers and aluminum accents, allowing buyers to personalize their vehicle. The dashboard layout was typical of the V221 S-Class, featuring a blend of traditional analog gauges and a central infotainment screen.
Chassis & Braking
The S 350 CDI BlueTEC 4MATIC utilized a fully independent suspension system, with multi-link setups at both the front and rear. This suspension design, combined with the adaptive damping system, provided a smooth and controlled ride. The 4MATIC all-wheel-drive system distributed power between the front and rear axles as needed, optimizing traction and stability. Braking duties were handled by disc brakes on all four wheels, equipped with ABS (Anti-lock Braking System) and electronic brake-force distribution. The braking system provided ample stopping power and a confident feel. Stabilizer bars were fitted to both the front and rear axles to minimize body roll during cornering.
Market Reception & Comparison
The S 350 CDI BlueTEC 4MATIC was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and luxurious interior. However, some reviewers noted that the diesel engine lacked the refinement and responsiveness of the gasoline engines. Compared to the S 550 models, the S 350 CDI offered significantly better fuel economy but less outright performance. Against other diesel-powered luxury sedans, such as the BMW 730d and Audi A8 3.0 TDI, the S 350 CDI held its own, offering a compelling combination of luxury, performance, and efficiency. Its reliability proved to be generally good, although the complex emissions control systems required periodic maintenance.
Legacy
The Mercedes-Benz S 350 CDI BlueTEC 4MATIC (V221) remains a desirable used car today, particularly for buyers seeking a luxurious and fuel-efficient grand tourer. The OM 642 engine is known for its durability, and with proper maintenance, these vehicles can provide many years of reliable service. However, potential buyers should be aware of the potential maintenance costs associated with the advanced emissions control systems. The S 350 CDI BlueTEC represents a significant chapter in the S-Class’s history, demonstrating Mercedes-Benz’s commitment to both luxury and efficiency.
