2009-2010 Mercedes-Benz S-class Long (V221 facelift ) S 350 CDI BlueEFFICIENCY (235 Hp) G-TRONIC

The Mercedes-Benz S 350 CDI BlueEFFICIENCY Long, produced from 2009 to 2010, represented a compelling blend of luxury, efficiency, and performance within the V221 S-Class generation (facelift). Positioned as a mid-range offering in the long-wheelbase S-Class lineup, it catered to buyers seeking a sophisticated and comfortable experience with reduced running costs compared to the higher-powered S 500 or S 600 models. This variant was primarily aimed at the European market, where diesel engines held significant popularity due to their fuel economy and torque characteristics, though limited examples were available in other regions. The “Long” designation indicates an extended wheelbase, providing increased rear passenger legroom – a key feature for chauffeur-driven executives and discerning customers.

Technical Specifications

Powertrain & Engine Architecture

The S 350 CDI BlueEFFICIENCY was powered by the OM 642.930 3.0-liter V6 turbodiesel engine. This engine was a cornerstone of Mercedes-Benz’s diesel offerings, known for its robust construction and refined operation. The ‘BlueEFFICIENCY’ designation indicated the inclusion of technologies aimed at improving fuel economy and reducing emissions, such as optimized combustion chamber geometry, reduced friction components, and an enhanced exhaust gas recirculation (EGR) system. The engine utilized a common rail direct injection system, delivering fuel at extremely high pressures for improved atomization and combustion efficiency. A variable geometry turbocharger (VGT) with an intercooler further enhanced performance and responsiveness. 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 output was a key characteristic of the engine, providing effortless acceleration and strong pulling power. The engine was mated to Mercedes-Benz’s 7G-TRONIC seven-speed automatic transmission, known for its smooth and quick shifts. This transmission was electronically controlled and offered a manual shift mode for greater driver involvement.

Driving Characteristics

The S 350 CDI BlueEFFICIENCY Long offered a distinctly different driving experience compared to its higher-powered S-Class siblings. While lacking the outright acceleration of the S 500 or S 600, the CDI model provided ample power for comfortable and confident cruising. The high torque output meant that overtaking maneuvers were executed with ease, and the engine felt relaxed even at highway speeds. The 7G-TRONIC transmission contributed to a smooth and refined driving experience, seamlessly shifting gears to maintain optimal engine speed. The long wheelbase provided a stable and comfortable ride, absorbing bumps and imperfections in the road surface effectively. The gear ratios were tuned for fuel efficiency and relaxed cruising, rather than outright performance. Compared to a manual transmission equipped S 350 CDI, the automatic offered greater convenience and ease of use, particularly in urban traffic. However, some enthusiasts might have preferred the greater control offered by a manual gearbox.

Equipment & Trim Levels

The S 350 CDI BlueEFFICIENCY Long 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 long wheelbase provided significantly more rear legroom, enhancing the comfort of rear passengers. Optional extras included features such as a panoramic sunroof, massaging seats, a rear entertainment system, and advanced driver-assistance systems like Distronic Plus (adaptive cruise control) and Lane Keeping Assist. The interior design was characterized by Mercedes-Benz’s signature blend of elegance and sophistication, with high-quality materials and meticulous attention to detail.

Chassis & Braking

The S-Class V221 chassis featured an advanced suspension system designed to provide a comfortable and controlled ride. The S 350 CDI Long utilized an air suspension system with adaptive damping, allowing the ride height and damping characteristics to be adjusted automatically based on driving conditions. The front suspension employed a multi-link design, while the rear suspension featured a multi-link independent suspension. Braking duties were handled by disc brakes on all four wheels, equipped with ABS and ESP for enhanced safety. The braking system provided ample stopping power and excellent control, even in adverse conditions.

Market Reception & Comparison

The S 350 CDI BlueEFFICIENCY Long was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined interior. Critics noted that while it lacked the outright performance of the higher-powered S-Class models, it offered a compelling value proposition for buyers seeking a luxurious and efficient sedan. Compared to the S 500, the CDI model offered significantly better fuel economy, but at the expense of some performance. Compared to the S 320 CDI (a shorter wheelbase version), the Long offered increased rear passenger space, making it a more appealing option for those who frequently transported passengers.

Legacy

The OM 642 engine family, including the OM 642.930 found in the S 350 CDI, has proven to be remarkably durable and reliable. With proper maintenance, these engines can easily exceed 200,000 miles. The 7G-TRONIC transmission is also known for its longevity, although some units may require servicing to address common issues such as valve body wear. In the used car market, the S 350 CDI BlueEFFICIENCY Long represents a good value proposition, offering a luxurious and well-equipped sedan at a relatively affordable price. However, potential buyers should be aware of the potential maintenance costs associated with a high-mileage luxury vehicle, including air suspension components and electronic systems.