2020-2023 Mercedes-Benz S-class (W223) S 500 (435 Hp) EQ Boost 4MATIC 9G-TRONIC

The Mercedes-Benz S 500 (W223), produced from 2020 to April 2023, represents a significant iteration of the flagship S-Class sedan. Positioned as a mid-to-upper range offering within the W223 generation, it bridged the gap between the entry-level S 450 and the more performance-focused AMG S 63. This variant distinguished itself through its innovative mild-hybrid powertrain, combining a turbocharged inline-six engine with an integrated electric motor for enhanced efficiency and performance. The W223 S-Class, overall, marked a substantial leap forward in technology, luxury, and driving dynamics for the brand.

Powertrain & Engine Architecture

At the heart of the S 500 lies the M 256.930 3.0-liter inline-six cylinder engine. This engine is a cornerstone of Mercedes-Benz’s modern powertrain strategy, utilizing a combination of advanced technologies to deliver both power and efficiency. It features direct fuel injection, a single turbocharger, and an electric auxiliary compressor. The electric compressor, powered by the 48-volt electrical system, provides near-instant boost at low engine speeds, effectively eliminating turbo lag and improving throttle response. The engine produces 435 horsepower at 5900-6100 rpm and 520 Nm (383.53 lb-ft) of torque between 1800-5500 rpm. A key element of the powertrain is its 48V mild-hybrid system. This system incorporates a 0.9 kWh lithium-ion battery and a 22 hp electric motor integrated between the engine and the 9G-TRONIC automatic transmission. The electric motor provides assistance during acceleration, allows for energy recuperation during braking, and enables a smooth and quiet start-stop function. The engine’s internal specifications include a bore of 83 mm (3.27 in), a stroke of 92.4 mm (3.64 in), and a compression ratio of 10.5:1. The engine oil capacity is 8 liters (8.45 US qt / 7.04 UK qt).

Transmission

The S 500 is exclusively equipped with the 9G-TRONIC nine-speed automatic transmission. This transmission is renowned for its smooth shifting, wide gear ratios, and efficiency. The nine speeds allow the engine to operate within its optimal efficiency range more frequently, contributing to improved fuel economy. The transmission is electronically controlled and features adaptive shift programs that adjust to the driver’s style and the driving conditions. The transmission’s gear ratios are optimized for both comfortable cruising and responsive acceleration.

Driving Characteristics

The S 500 delivers a refined and powerful driving experience. The combination of the turbocharged inline-six engine and the electric motor results in strong acceleration, with a 0-100 km/h (0-62 mph) time of 4.9 seconds and a 0-60 mph time of 4.7 seconds. The electric auxiliary compressor effectively mitigates turbo lag, providing immediate power delivery. The 48V mild-hybrid system contributes to a seamless and almost imperceptible transition between electric and gasoline power. Compared to the S 450, the S 500 offers noticeably more power and a more responsive feel. While not as overtly sporty as the AMG S 63, the S 500 provides ample performance for both city driving and highway cruising. The 9G-TRONIC transmission shifts smoothly and efficiently, enhancing the overall driving experience. The car’s weight of 1970 kg (4343.11 lbs) is well-managed by the powertrain, resulting in a balanced and confident feel.

Equipment & Trim Levels

The S 500 came standard with a comprehensive array of luxury features. Standard interior appointments included premium leather upholstery, wood trim, and ambient lighting. The dashboard featured the latest generation of Mercedes-Benz’s MBUX infotainment system, with a large touchscreen display and advanced voice control. Standard safety features included adaptive cruise control, lane keeping assist, automatic emergency braking, and a 360-degree camera system. Optional extras included a Burmester high-end sound system, rear-seat entertainment, massaging seats, and a head-up display. The S 500 was typically offered with a choice of interior color schemes and trim materials, allowing buyers to personalize their vehicle. Exterior options included a variety of wheel designs and paint colors.

Chassis & Braking

The S 500 utilizes an independent multi-link suspension system at both the front and rear axles. Air suspension is standard, providing a smooth and comfortable ride. The air suspension system automatically adjusts the ride height and damping characteristics based on the driving conditions and the selected driving mode. The car features ventilated disc brakes at all four corners, providing ample stopping power. Anti-lock braking system (ABS) is standard, along with electronic stability control. Available options included 4-wheel steering, which enhances maneuverability at low speeds and stability at high speeds. The S 500’s chassis is designed to provide a balance between comfort and handling. The weight distribution is optimized for neutral handling characteristics.

Market Reception & Comparison

The S 500 was generally well-received by automotive critics. It was praised for its refined powertrain, luxurious interior, and advanced technology. The mild-hybrid system was lauded for its ability to improve both performance and efficiency. Fuel consumption figures, according to WLTP, ranged from 8-9.4 l/100 km (29.4 – 25 US mpg, 35.3 – 30.1 UK mpg, 12.5 – 10.6 km/l). CO2 emissions ranged from 181-214 g/km. Compared to the S 450, the S 500 offered a noticeable performance upgrade without the significantly higher price tag of the AMG S 63. Compared to other luxury sedans in its class, such as the BMW 7 Series and the Audi A8, the S 500 was considered to be a competitive offering, particularly in terms of technology and interior refinement. Reliability reports have been generally positive, with few major issues reported.

Technical Specifications

Legacy

The S 500 (W223) represents a pivotal step in Mercedes-Benz’s transition towards electrified powertrains. The integration of the 48V mild-hybrid system demonstrated the brand’s commitment to improving fuel efficiency and reducing emissions without sacrificing performance. On the used car market, the W223 S 500 holds its value well, reflecting its luxurious appointments, advanced technology, and strong performance. The M 256 engine has proven to be a reliable and durable unit, with few widespread issues reported. The S 500’s combination of comfort, technology, and performance continues to make it a desirable choice for buyers seeking a high-end luxury sedan.