
Mercedes C-Class C205 Engines — The Complete UK Guide
Every engine fitted to the second-generation C-Class Coupé — from the M274 four-cylinder petrol to the M276 V6 and the M177 V8 that powers the AMG C63. Real UK costs, honest reliability data, and the 2018 facelift's M264 engine switch explained. Backed by real UK enquiries in 2025 [PATTERN DATA].
Explore C205 EnginesMercedes C-Class C205 Engine Codes — The Complete Database
Every engine fitted to the C205 coupé specifically — including pre-facelift M274/M276 units and post-facelift M264/M177/OM654 replacements.

Overview
Mercedes C-Class C205 — Overview
The C205 is the second-generation Mercedes-Benz C-Class Coupé, produced from 2015 to 2023 as the two-door counterpart to the W205 saloon.
It shares the Modular Rear Architecture (MRA) platform with the saloon and estate, offering a sleeker, more sporting profile. The engine range spanned M274 and M264 four-cylinder petrols, M276 V6 petrols in the C400 and AMG C43, the M177 V8 in AMG C63 guise, plus OM651 and OM654 diesel four-cylinders. A significant 2018 facelift brought new M264 engines, a power increase for the C43, and the OM654 diesel.
Key Facts
Platform
Mercedes MRA (Modular Rear Architecture)
Predecessor
Mercedes-Benz C-Class C204
Successor
Mercedes-Benz CLE (C236)
Sibling body styles in this generation
W205 saloon, S205 estate, A205 cabriolet
Market Intelligence
The C205 C-Class Coupé generated UK engine enquiries in 2025 [PATTERN DATA], with the <a href='https://mercedesengines.uk/engine/m274'>M274</a> petrol fours and OM651 diesels remaining the most commonly discussed among specialists.
Best & Worst Engines

Thin-Data Summary
“Thin-Data Fallback mode — one paragraph: The C205's most dependable engine is the M274 2.0-litre four-cylinder petrol (C300, 245 PS) — widely considered the pick of the pre-facelift range for its strong performance, proven durability, and relative simplicity. The facelift M264 2.0-litre (C300, 258 PS) adds EQ Boost mild-hybrid technology, improving refinement and economy. The OM651 2.1-litre diesel line is robust and economical — the C250d's 204 PS offers strong real-world performance with excellent fuel economy. The OM654 diesel introduced with the facelift is a significant improvement — quieter, more refined, and with better low-end torque. The AMG C63's M177 V8 is a masterpiece but carries high running costs — hot-vee design means heat-related wear on ancillaries, and parts are eye-wateringly expensive. Avoid any pre-facelift car without documented service history, as the M274's camshaft adjusters and OM651's injector seals are known weak points.”
Who it's for:

Mercedes C-Class C205 — Ownership Economics
The C205 rule
A £2,200–£4,000 recon on a sub-£10,000 C205 sits at 22–40% of the car's value — viable on most examples. Against a £4,000 engine bill on a C63, the car's value determines the decision — a £35,000 C63 justifies an £8,000–£14,000 recon; a £15,000 example makes it a much harder call. Value the car first, then the engine.
Key Takeaways
Which C205 Costs Least To Own?
C200d (OM651) — proven diesel, 60+ MPG, cheap parts.
Which C205 Costs Most To Own?
AMG C63 S (M177) — V8 complexity, specialist-only work, eye-watering parts prices.
Which C205 Is Best Value?
C300 (M274.920) — 245 PS, reliable four-pot, strong performance without V6 running costs.
Common Problems

C205 Engine Replacement Costs — By Engine and Condition
Core Variants
Core Variants
Petrol Variants
Scope note: All variants listed are C205 coupé only. W205 saloon, S205 estate, and A205 cabriolet share most of these engines but are covered on their own Generation Pages, since body style affects weight, aerodynamics, and to some extent, labour access. The CLE (C236) succeeded the C205 from 2023.
Market Intelligence
Most Requested E90 Engines (2025)
Most Requested E90 Variants
Average E90 Replacement Cost
Most Common E90 Failures
FAQ

Why UK Mercedes C-Class C205 Owners Trust MercedesEngines.uk
Trusted C205 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Mercedes owners, as part of the Engine Finders network. We only work with specialists who understand the C205's MRA platform and engine complexities.
Compare C205 Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit. Whether you need a reconditioned M274 or a used M177, we show you the real market.
UK Engine Replacement Services for C205
covering every variant from C180 to AMG C63 S, with supply-only or full supply & fit available nationwide through our vetted specialist network.
Find the best Mercedes C-Class C205 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.





