The Mercedes-Benz S 500 V8 (455 Hp) 9G-TRONIC represents a high-performance variant within the W222 generation of the S-Class, produced from 2016 to 2017. Positioned as a premium offering within the S-Class lineup, it bridged the gap between the more accessible S 400/500 models and the ultra-luxury S 600/63 AMG versions. The W222 S-Class, launched in 2013, represented a significant leap forward in automotive technology and luxury, and the S 500 V8 exemplified this with its powerful engine, advanced transmission, and comprehensive suite of features. It was built on the Mercedes-Benz M222 platform, a sophisticated chassis designed for superior ride comfort and handling.
Powertrain & Engine Architecture
At the heart of the S 500 V8 lies the M278.929 engine, a 4.7-liter (4663 cc) V8 gasoline engine. This engine is characterized by its twin-turbocharged configuration, employing two exhaust gas turbochargers to significantly boost power and torque. The engine utilizes direct fuel injection, a technology that precisely meters fuel directly into the combustion chamber, improving efficiency and reducing emissions. The valvetrain is a Double Overhead Camshaft (DOHC) design with four valves per cylinder, optimizing airflow for enhanced performance. The engine produces 455 horsepower at 5250-5500 rpm and a substantial 700 Nm (516.29 lb-ft) of torque between 1800-3500 rpm.
Paired with the M278 engine is the 9G-TRONIC nine-speed automatic transmission. This transmission is a key component of the S 500’s efficiency and driving experience. The nine forward gears allow for closer ratios, keeping the engine operating within its optimal power band more frequently. The 9G-TRONIC features a torque converter lockup clutch that minimizes energy loss and improves fuel economy. It also incorporates shift paddles for manual gear selection, providing the driver with greater control. The transmission’s gear ratios are tuned to balance acceleration with cruising efficiency, offering both responsive performance and relaxed highway driving.
Engine Specifications (M278.929)
- Displacement: 4663 cm³ (284.55 cu. in.)
- Configuration: V8
- Bore x Stroke: 92.9 mm x 86 mm (3.66 in x 3.39 in)
- Compression Ratio: 10.0:1
- Fuel Injection: Direct Injection
- Turbocharging: Twin-Turbo with Intercooler
- Valvetrain: DOHC, 4 valves per cylinder
Driving Characteristics
The S 500 V8 delivers a driving experience that prioritizes both performance and comfort. Acceleration from 0 to 100 km/h (0-62 mph) is achieved in 4.8 seconds, and 0-60 mph in approximately 4.6 seconds. The twin-turbo V8 provides ample power for effortless overtaking and confident highway cruising. The 9G-TRONIC transmission contributes to smooth and seamless gear changes, enhancing the overall refinement. Compared to the base S 400/500 models with smaller engines, the S 500 V8 offers a noticeably more responsive and powerful driving experience. While not as overtly sporty as the AMG variants, the S 500 V8 provides a satisfying level of performance for a luxury sedan.
The electronically limited top speed of 250 km/h (155.34 mph) ensures ample performance while maintaining safety. The rear-wheel drive configuration provides a traditional luxury car feel, although all-wheel drive (4MATIC) was available as an option. The air suspension system, standard on the S 500, further enhances ride comfort by automatically adjusting to road conditions.
Equipment & Trim Levels
The S 500 V8 came standard with a comprehensive array of luxury features. Interior upholstery typically consisted of high-quality leather, with a wide range of color options available. Wood trim, often in burled walnut or similar finishes, adorned the dashboard and door panels. Standard equipment included heated and ventilated front seats with massage functions, a premium sound system, a large infotainment display with navigation, and a suite of driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking.
Optional extras were plentiful, allowing buyers to further personalize their S 500. These included rear-seat entertainment systems, upgraded leather packages, a panoramic sunroof, and various exterior styling enhancements. The S 500 V8 often served as a platform for showcasing Mercedes-Benz’s latest technological innovations, making it a desirable choice for those seeking a cutting-edge luxury experience.
Chassis & Braking
The W222 S-Class chassis is engineered for exceptional ride quality and handling. The S 500 V8 utilized an air suspension system on both the front and rear axles, providing a smooth and controlled ride. This system automatically adjusts the suspension damping and ride height based on road conditions and driving style. The steering system is a rack-and-pinion design with electric power steering, offering precise and responsive control.
Braking duties are handled by ventilated discs on all four wheels. The anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, enhancing safety and stability. The S 500 V8’s weight of approximately 1920 kg (4232.88 lbs) is managed effectively by the robust braking system and sophisticated suspension.
Market Reception & Comparison
The S 500 V8 was generally well-received by automotive critics. It was praised for its powerful engine, smooth transmission, luxurious interior, and advanced technology. Fuel economy, while not a primary concern for S-Class buyers, was considered reasonable for a vehicle of its size and performance, ranging from 8.2-8.9 l/100 km (28.7-26.4 US mpg). Compared to the S 400/500 models, the S 500 V8 offered a significant performance upgrade, while remaining more affordable and less overtly sporty than the S 63 AMG. Reliability was generally good, although the complex technology of the W222 S-Class could potentially lead to higher maintenance costs over the long term.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-Class |
| Generation | S-Class (W222) |
| Type | S 500 V8 (455 Hp) 9G-TRONIC |
| Start of Production | 2016 |
| End of Production | 2017 |
| Body Type | Sedan |
| Seats | 4-5 |
| Doors | 4 |
| Fuel Consumption (Urban) | 11.4-11.8 l/100 km (20.6 – 19.9 US mpg) |
| Fuel Consumption (Extra Urban) | 6.4-7.1 l/100 km (36.8 – 33.1 US mpg) |
| Fuel Consumption (Combined) | 8.2-8.9 l/100 km (28.7 – 26.4 US mpg) |
| CO2 Emissions | 192-206 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0-100 km/h | 4.8 sec |
| Acceleration 0-62 mph | 4.8 sec |
| Acceleration 0-60 mph | 4.6 sec |
| Maximum Speed | 250 km/h (155.34 mph) |
| Engine Displacement | 4663 cm³ (284.55 cu. in.) |
| Power | 455 Hp @ 5250-5500 rpm |
| Torque | 700 Nm @ 1800-3500 rpm (516.29 lb.-ft.) |
| Engine Layout | Front, Longitudinal |
| Engine Model/Code | M 278.929 |
| Number of Cylinders | 8 |
| Engine Configuration | V-engine |
| Kerb Weight | 1920 kg (4232.88 lbs.) |
| Fuel Tank Capacity | 80 l (21.13 US gal) |
| Transmission | 9-speed automatic (9G-TRONIC) |
| Drive Type | Rear-wheel drive |
| Length | 5116 mm (201.42 in.) |
| Width | 1899 mm (74.76 in.) |
| Height | 1496 mm (58.9 in.) |
Legacy
The M278 engine, found in the S 500 V8, has proven to be a relatively reliable powerplant when properly maintained. Common issues, as with many modern turbocharged engines, can include carbon buildup on the intake valves and potential oil leaks. The 9G-TRONIC transmission is also generally reliable, but requires regular fluid changes to ensure smooth operation. On the used car market, the W222 S 500 V8 holds its value well due to its combination of performance, luxury, and technology. However, potential buyers should be prepared for potentially higher maintenance costs compared to more basic S-Class models. The S 500 V8 remains a desirable choice for those seeking a sophisticated and powerful luxury sedan.
