Mercedes-Benz S 500

Core summary

U.S. MY2021 W223 S 500 4MATIC sedan. Source-based specification and buying analysis.

The S 500 should be evaluated from the seat you will occupy most often. A driver-owner and a rear-seat passenger can reasonably prefer different options even when considering the same car.

History & generations

This reference is the new-generation U.S. MY2021 S-Class. The S 500 and S 580 share the launch range but use different engines.

Body, platform & design

The U.S. specification lists a 126.6-inch wheelbase and 208.2-inch overall length. Measure the parking space before deciding that rear-cabin room is a free benefit.

Engine & drivetrain

The S 500 has a 3.0-liter inline-six with EQ Boost, rated at 429 hp and 384 lb-ft. The nine-speed automatic drives all four wheels.

Trim differences

The S 580’s 4.0-liter V8 is a distinct engine choice. Its output should not be attached to an S 500 with similar cabin options.

Interior & seating

Make a passenger-side checklist covering entry, seat adjustment and the controls used during a long journey. Demonstrate every costly comfort option instead of assuming that flagship status means it is fitted.

Efficiency & range

The launch reference lists fuel economy as TBA. It cannot support a numeric consumption claim; obtain the later official label for the exact model year.

Safety & equipment

Ask the seller to identify the fitted assistance systems and demonstrate their settings while parked. A highly automated-looking cockpit does not establish permission for hands-off or unattended driving.

Strengths

Our interpretation is that a well-chosen cabin specification can matter more than upgrading the engine badge. The purchase should reward the way you travel, not merely the most impressive entry in a brochure.

Considerations

For a used S-Class, organize an electronic-system scan and inspect the operation of individual seat, climate and display functions. Record repair estimates before deciding how much apparent depreciation represents real value.

Recommended use

A chauffeur-oriented trial should include the intended rear passenger. An owner-driver trial should include parking and low-speed maneuvering. Combining those perspectives prevents a purchase that satisfies only half the household.

Rivals & related

Compare an S 580 with equivalent comfort equipment and condition. Otherwise a higher asking price may be buying rear-seat options you want, an engine you do not need, or both.

FAQ

Is EQ Boost included in the permanent engine rating? The guide lists up to 21 hp of electrical assistance separately from the 429-hp combustion-engine output.

Sources & updates

Reference scope: U.S. MY2021 W223 S 500 4MATIC sedan. Research-based guide; no hands-on road test is claimed. Manufacturer specifications are distinguished from Cariary buying interpretation. Text reviewed 14 October 2026. Sources for the revised text:

https://media.mbusa.com/news/mercedes-benz-s-class-sedan-quick-reference-guide-2021

• Manufacturer reference — U.S. MY2021 W223 S 500 4MATIC sedan →Source used for the stated historical model-year specification; not a claim of a current range.
• Photo 1 — OWS Photography / Wikimedia Commons / CC BY 4.0 →Resized and encoded as WEBP; original composition retained. Mercedes-Benz S 500 W223, front view. W223 S 500 photographed in 2025, illustrating the generation launched for MY2021. Equipment may differ by year and market.
• Photo 2 — OWS Photography / Wikimedia Commons / CC BY 4.0 →Resized and encoded as WEBP; original composition retained. Mercedes-Benz S 500 W223, rear view. W223 S 500 photographed in 2025, illustrating the generation launched for MY2021. Equipment may differ by year and market.

Last editorial review: October 14, 2026. Specifications remain market- and model-year-specific.