Mercedes S-Class W223 Engines — The Complete UK Guide
Every engine fitted to the seventh-generation S-Class — from the straight-six petrols and diesels to the biturbo V8, the V12 and the electrified AMG flagship. Backed by real UK enquiries in 2025 [MB-VERIFIED].
Explore W223 Engines
Mercedes S-Class W223 Engine Codes — The Complete Database
Every engine fitted to the W223/V223 chassis — from the M256 straight-six petrols to the OM656 diesels, the M176/M177 V8s and the M279 V12.
Overview
Mercedes S-Class W223 — Overview
The Mercedes-Benz S-Class W223 — the seventh generation of the flagship saloon — was unveiled in September 2020 as the most technologically advanced S-Class yet.
Built on the MRA2 platform, the W223 introduced second-generation MBUX with a 12.3-inch digital instrument cluster and a 12.8-inch OLED portrait touchscreen. The engine range carries over from the W222 with inline-six, V8 and V12 options, all featuring 48V mild-hybrid EQ Boost technology. For the first time, the V12 engine is fitted with 4MATIC all-wheel drive, exclusive to the S 680 Guard 4MATIC. Plug-in hybrid variants (S 580 e) and the AMG S 63 E Performance joined the range from 2022 onwards. The W223 is offered in both standard (W223) and long-wheelbase (V223) forms.
Key Facts
Platform
Mercedes MRA2
Predecessor
W222 (2013–2020)
Successor
Currently in production
Sibling body styles in this generation
V223 (long wheelbase), Z223 (Mercedes-Maybach)
Market Intelligence
No [MB-VERIFIED] enquiry data exists for the S-Class W223 — the model is absent from EM_Proprietary_Data's per-model table, reflecting its low-volume UK status as the brand's flagship.
Best & Worst Engines
Thin-Data Summary
“The W223 S-Class engine range represents the pinnacle of Mercedes powertrain technology, with electrification now standard across the board. For most buyers, the S 350 d (OM656 diesel) is the sensible choice: a refined, economical straight-six that delivers 286 bhp and 600 Nm of torque — more than adequate for wafting duties. The S 500 (M256 petrol) offers 435 bhp from a smooth straight-six with 48V mild-hybrid assistance — a genuinely effortless drivetrain. The S 580 (M176 V8) delivers 503 bhp from the 4.0-litre biturbo V8, combining effortless power with surprising efficiency thanks to cylinder deactivation and mild-hybrid tech. The AMG S 63 E Performance is a technological tour-de-force: 603 bhp from the V8 plus 188 bhp from the electric motor, producing a combined 750 Nm of torque — but it's complex and expensive. The S 680 (M279 V12) is the range-topper: 612 bhp and 830 Nm of torque from a 6.0-litre biturbo V12, but it's reserved for the armoured S 680 Guard and Mercedes-Maybach variants. Buying instruction: for most buyers, the S 350 d offers the best balance of refinement, economy and reliability; the S 500 petrol is the pick for those who want the smoothest straight-six experience. The V8 and V12 variants are for those who value the badge and the experience over running costs.”
Who it's for:
Mercedes S-Class W223 — Ownership Economics
The W223 rule
A £4,000–£6,500 S 350 d recon against a £40,000–£80,000 W223 sits at 5–16% of the car's value — well within the 70% Mercedes threshold for almost every example. Even the most expensive recon (£20,000 for the V12) sits at 25–50% of a well-kept example's value. The W223's high residual values mean engine replacement is almost always financially viable — the question is whether the car's overall condition justifies the spend.
Key Takeaways
Which W223 Costs Least To Own?
S 350 d (OM656) — refined diesel, lower running costs, strong economy.
Which W223 Costs Most To Own?
AMG S 63 E Performance (M177) — PHEV complexity, AMG-specific parts, high running costs.
Which W223 Is Best Value?
S 350 d (OM656) — the most sensible engine in the range with strong economy and refinement.
Common Problems
W223 Engine Replacement Costs — By Engine and Condition
Core Variants
Core Variants
Diesel Variants
Scope note: All variants listed are W223/V223 (S-Class, 2020–present) only. The S 450 4MATIC (M256, 367 bhp) is available in select markets but omitted from the UK core listing due to limited availability; UK-market S-Class models typically start with the S 500. The S 680 Guard 4MATIC is the armoured variant; the Mercedes-Maybach S-Class (Z223) shares the same engine codes but is covered on a separate Maybach Generation Page where body-specific parts and costs differ. The AMG S 63 E Performance was introduced in 2023.
Market Intelligence
Most Requested E90 Engines (2025)
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FAQ
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UK Engine Replacement Services for W223
covering every variant from the S 350 d to the AMG S 63 E Performance, with supply-only or full supply-and-fit available nationwide.
Find the best Mercedes S-Class W223 engine replacement UK drivers rely on. Compare real prices from trusted Mercedes specialists on EnginesMarket today and get back on the road with confidence.
