2009-2011 Mercedes-Benz S-class (W221 facelift ) S 500 V8 (388 Hp) G-TRONIC

The Mercedes-Benz S 500 V8 (388 hp) G-TRONIC, produced from 2009 to 2011, represents a significant iteration of the W221 S-Class generation, following the model’s facelift. Positioned as a high-performance variant within the S-Class range, it offered a blend of luxury, technology, and substantial power. The W221 S-Class, launched in 2005, was a technologically advanced vehicle built on the Mercedes-Benz platform, aiming to solidify the brand’s reputation for innovation and refinement in the full-size luxury sedan segment. The 2009 facelift brought revised styling, updated technology, and improvements to the engine lineup, with the S 500 V8 being a key component of that update.

Powertrain & Engine Architecture

The heart of the S 500 V8 is the M273.961 5.5-liter naturally aspirated V8 engine. This engine, a cornerstone of Mercedes-Benz’s performance offerings during this period, produces 388 horsepower at 6000 rpm and 530 Nm (390.91 lb-ft) of torque between 2800 and 4800 rpm. The engine features a compression ratio of 10.7:1 and utilizes multi-port fuel injection. Each cylinder is equipped with four valves, contributing to the engine’s efficient breathing and power output. The engine is longitudinally mounted in the front of the vehicle, driving the rear wheels.

Paired with the M273.961 engine is the 7G-TRONIC seven-speed automatic transmission. This transmission, known for its smooth and responsive shifts, was a significant advancement in automatic transmission technology. It features a torque converter lock-up clutch that engages in most gears, improving fuel efficiency and reducing slippage. The 7G-TRONIC also offers a manual shift mode, allowing the driver to select gears for more spirited driving. The transmission’s gear ratios are optimized for both performance and fuel economy, providing a balance between acceleration and cruising efficiency.

Engine Details: M273.961

The M273 engine family, including the 961 variant, was known for its robust construction and relatively straightforward maintenance compared to some of the later, more complex Mercedes-Benz engines. It utilizes a three-valve per cylinder design, with two intake valves and one exhaust valve. This configuration, combined with the variable valve timing system, optimizes airflow into and out of the cylinders, enhancing both power and efficiency. The engine also incorporates a lightweight construction, utilizing aluminum alloy components to reduce weight and improve thermal management.

Driving Characteristics

The S 500 V8 delivers a refined and powerful driving experience. Acceleration from 0 to 100 km/h (0-62 mph) takes approximately 5.4 seconds, and 0-60 mph is achieved in around 5.1 seconds. The engine’s broad torque curve provides strong acceleration in any gear, making overtaking maneuvers effortless. The 7G-TRONIC transmission contributes to the smooth and seamless power delivery, minimizing shift shock and maximizing comfort. Compared to the S 350 models, the S 500 V8 offers a significantly more engaging and dynamic driving experience. While not as overtly sporty as some of its competitors, the S 500 V8 provides a confident and composed ride, even at high speeds. Compared to the later S 550 models with forced induction, the S 500 V8 offers a more linear power delivery, favored by some drivers for its predictability.

Equipment & Trim Levels

The S 500 V8 came standard with a comprehensive array of luxury features. Interior appointments typically included high-quality leather upholstery, wood trim, and a premium sound system. Standard equipment also included features such as automatic climate control, power-adjustable seats with memory function, a navigation system, and a sunroof. Optional extras included features such as a rear-seat entertainment system, massaging seats, and advanced driver-assistance systems like Distronic Plus (adaptive cruise control) and Pre-Safe brake assist. The S 500 V8 was generally offered with a relatively limited number of trim packages, focusing on enhancing the existing luxury features rather than drastically altering the vehicle’s appearance or performance.

Chassis & Braking

The S 500 V8 features a fully independent suspension system, providing a comfortable and controlled ride. The front suspension utilizes a multi-link design with coil springs and shock absorbers, while the rear suspension employs a similar setup. The suspension is tuned to prioritize ride comfort, but also provides adequate handling performance. The S 500 V8 is equipped with disc brakes on all four wheels, providing ample stopping power. The braking system also includes ABS (Anti-lock Braking System) and Electronic Stability Program (ESP) to enhance safety and control. The vehicle’s curb weight of 1880 kg (4144.69 lbs) is managed effectively by the suspension and braking systems, resulting in a stable and predictable driving experience.

Market Reception & Comparison

The S 500 V8 was generally well-received by automotive critics, who praised its powerful engine, smooth transmission, and luxurious interior. Fuel economy, however, was a common point of criticism, with combined fuel consumption ranging from 11.0 to 11.2 liters per 100 kilometers (21.4 to 21.0 US mpg). Compared to the S 350 models, the S 500 V8 offered a significant performance upgrade, but at the cost of increased fuel consumption. Reliability was generally good, although some owners reported issues with the air suspension system and electronic components. The S 500 V8 represented a compelling alternative to its competitors, such as the BMW 750i and the Audi A8, offering a unique blend of luxury, performance, and technology.

Technical Specifications

Legacy

The M273 engine, found in the S 500 V8, has proven to be a relatively durable and reliable powertrain when properly maintained. While some components, such as the valve cover gaskets and timing chain tensioners, are known to require periodic attention, the engine itself is generally considered robust. In the used car market, the W221 S 500 V8 remains a desirable option for buyers seeking a luxurious and powerful sedan. However, potential buyers should be aware of the potential maintenance costs associated with a high-end vehicle of this age. The S 500 V8 represents a high point in Mercedes-Benz’s engineering and design, offering a compelling combination of performance, luxury, and technology that continues to appeal to enthusiasts today.