How much does a Mercedes-AMG C63 engine replacement cost in the UK?

A reconditioned M156 engine typically costs £5,000–£8,500 supply only; a reconditioned M177 costs £6,000–£11,000; a reconditioned M139l hybrid costs £10,000–£15,000. Used units are available from £2,000–£5,000. Fitting adds £2,000–£3,500. A replacement M156 engine can cost up to £11,744. Use our calculator for a figure specific to your C63.

What are the common problems with the Mercedes-AMG C63?

M156: head bolt failure (pre-2011 — the most critical concern), camshaft and lifter wear, carbon build-up on intake valves, crankcase breather valve failure. M177: ignition coil failure (recall issued), high oil and water temperatures, cooling system issues. M139l: hybrid system complexity, lack of V8 character.

Is it worth replacing a Mercedes-AMG C63 engine, or should I scrap the car?

C63 values remain strong — a well-kept W204 is often worth £15,000–£30,000, W205 cars fetch £25,000–£45,000, and W206 cars are £60,000+. A £5,000–£15,000 reconditioned engine is 15–40% of the vehicle's value — apply the Mercedes 70% scrap threshold. If the car is a cherished example, replacement is often worthwhile.

How do I find my Mercedes-AMG C63 engine code?

Listed on the VIN plate and vehicle documentation. W204 (2007–2014) uses M156; W205 (2014–2021) uses M177; W206 (2021+) uses M139l. For W204, check the engine number — #60658+ has revised head bolts. Tell us your registration date and we'll confirm it for free.

Can I repair the M156 head bolts, or does the engine need replacement?

The head bolts can be replaced — they are a known weak point. Replacement costs £5,000–£6,000. If the bolts fail and cause head gasket problems, the engine can be destroyed. A preventative head bolt replacement (with aftermarket studs) is far cheaper than a full engine replacement (£5,000+). At the first sign of clicking on cold start or coolant loss on a pre-2011 M156, book an inspection immediately.

Mercedes-AMG C632007–present3 Engine Generations

Mercedes-AMG C63 Engine Replacement — Compare Prices & Get Quotes

Name: Mercedes-AMG C63 UK Engine Enquiry Data 2025
Creator: MercedesEngine.uk

The C63 AMG has worn three legendary powertrains over its lifetime — the thundering 6.2-litre M156 V8, the twin-turbo 4.0-litre M177 V8, and the hybridised 2.0-litre M139l four-cylinder. Each has its own character, reliability profile and running costs. Get quotes from UK specialists for reconditioned, rebuilt and used units today.

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Mercedes-AMG C63 Engines — from £2,000 to £15,000Common codes: M156, M177, M139l

Mercedes-AMG C63 Engines — from £2,000 to £15,000· Common codes: M156, M177, M139l

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The C63 THROUGH TIME — Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes-AMG C63 Engine Replacement Costs

Supply Only£5,000–£8,500

Fitted (Indie)£7,000–£10,500

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,000–£5,000£4,000–£7,5001–6 monthsBudget priority; older W204 examples

Reconditioned Engine£5,000–£8,500£7,000–£10,50012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£7,500–£15,000£9,500–£17,50012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£12,000–£20,000+£14,000–£23,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the current C63 AMG market. The M156 is the cheapest to replace; the M177 commands a premium; the M139l hybrid is the most expensive due to its complexity. A replacement M156 engine can cost up to £11,744. Head bolt replacement on the M156 costs approximately £5,000–£6,000.

Labour estimate: Fitting a C63 AMG engine typically takes 14–20 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The M177's hot-vee design and the M139l's hybrid system add significant complexity.

→ Compare C63 AMG engine prices from UK specialists

Common Problems

1. M156 Head Bolt Failure (W204 — Pre-2011)

Symptoms: Clicking noises on cold start, rising oil level, coolant loss requiring frequent top-ups, head gasket failure, bent rods, eventual engine failure

Typical mileage: 40,000–80,000 miles

Repair cost: £5,000–£6,000 (head bolt and head gasket replacement)

Replacement cost: £5,000–£8,500 (if head bolt failure destroys the engine)

🔴 Immediate - this is the single biggest risk on the early M156

Our recommendation:

The M156's head bolts corrode and fail due to a design flaw. The bolts stretch during installation, exposing the tops to corrosive elements. The issue affects C63s up to the 2011 model year (engine #60658 onwards received revised bolts). If you're buying a pre-2011 C63, check the engine number. If it's below #60658, budget for head bolt replacement immediately. Many owners recommend using aftermarket studs instead of bolts. A £5,000–£6,000 repair is far cheaper than a £5,000–£8,500 engine replacement.

Read the full head bolt failure guide

1. M156 Head Bolt Failure (W204 — Pre-2011)

Symptoms: Clicking noises on cold start, rising oil level, coolant loss requiring frequent top-ups, head gasket failure, bent rods, eventual engine failure

Typical mileage: 40,000–80,000 miles

Repair cost: £5,000–£6,000 (head bolt and head gasket replacement)

Replacement cost: £5,000–£8,500 (if head bolt failure destroys the engine)

🔴 Immediate - this is the single biggest risk on the early M156

Our recommendation:

Read the full head bolt failure guide

2. M156 Camshaft and Lifter Wear (W204)

Symptoms: Ticking or tapping noise from the top of the engine on cold start, reduced performance, metallic debris in oil, eventual camshaft failure

Typical mileage: 50,000–100,000 miles

Repair cost: £2,000–£4,500 (camshaft and lifter replacement)

Replacement cost: £5,000–£8,500 (if wear causes catastrophic engine damage)

🔴 Immediate - if you hear ticking from the top of the engine, have it inspected immediately

Our recommendation:

The M156 suffers from premature camshaft and lifter wear. A class action lawsuit was filed in 2011 alleging that Mercedes knew about the problem. The issue is caused by soft metal in the camshafts that was improperly heat-treated. If you notice ticking or tapping on cold start, have the camshafts and lifters inspected immediately. Using the correct MB-spec oil and changing it regularly can help prevent this issue. If caught early, lifter replacement is far cheaper than a full camshaft replacement.

Read the full camshaft and lifter wear guide

3. M177 Ignition Coil Failure (W205)

Symptoms: Misfire under load, rough idle, engine warning light, reduced power, CEL illumination

Typical mileage: 30,000–60,000 miles

Repair cost: £300–£600 (ignition coil replacement)

Replacement cost: N/A — repair only

🟠 Check - book inspection urgently

Our recommendation:

MB issued a product recall in 2018 for faulty ignition coils on M177 engines (part A1779069500). If your car hasn't had the recall completed, check with your dealer. Replacing a faulty coil with the same part number is not recommended — you'd be replacing a faulty component with another of the same design. If you experience misfires or a CEL, have the ignition system inspected. A £300–£600 coil replacement is far cheaper than the consequences of a misfire damaging the catalytic converters.

Read the full ignition coil failure guide

4. M177 Cooling System and Oil Temperature Issues (W205)

Symptoms: High oil and water temperatures, performance loss, overheating warnings, reduced power under sustained load

Typical mileage: 30,000–70,000 miles

Repair cost: £500–£2,000 (cooling system upgrades or repairs)

Replacement cost: £6,000–£10,000 (if overheating causes engine damage)

🟠 Check - book inspection urgently

Our recommendation:

The M177's hot-vee design generates extreme heat loads. The engine tends to have high oil and water temperatures even in standard production form. Insufficient cooling can lead to overheating and performance loss. If you track your C63 or drive it hard, consider upgrading the cooling system. Check coolant and oil temperatures regularly. If you notice temperatures climbing, have the cooling system inspected. A £500–£2,000 cooling system upgrade is far cheaper than a £6,000–£10,000 engine replacement.

Read the full cooling system failure guide

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C63 AMG — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

C63 AMG — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseM156 head bolt failure (pre-2011)✅ Yes£5,000–£6,000Essential upgrade — far cheaper than a full engine replacementM156 camshaft/lifter wear✅ Yes£2,000–£4,500Catch early; cheaper than a full engineM156 carbon build-up✅ Yes£500–£1,200Walnut blasting — well-understood by AMG specialistsM177 ignition coil failure✅ Yes£300–£600Simple replacement — check recall statusM177 cooling system issues✅ Yes£500–£2,000Upgrade cooling — essential for track useM177 turbocharger failure✅ Yes£2,500–£5,000Labour-intensive; catch before debris damages the engineM139l hybrid system issues✅ Yes£2,000–£5,000+Complex; ensure warranty coverage

Buying This C63 AMG? Check These First

Buy If

W204 (2011+) with revised head bolts (engine #60658+) — the defining weakness addressed
W205 with documented ignition coil recall work completed — a common failure point
Full service history with correct MB-spec oil — all three engines are unforgiving of neglect
Evidence of carbon cleaning on M156 — intake valves benefit from walnut blasting
W206 with comprehensive warranty — the hybrid system is complex and expensive to repair

Avoid If

W204 (pre-2011) with no proof of head bolt work — you're buying a known risk
Any ticking from the top of the engine on M156 — camshaft/lifter wear is likely
W205 with misfire codes and no ignition coil history — coil failures are common
W206 with any hybrid system warnings — repairs are expensive
Poor service history — all three engines are unforgiving of neglect

Closing Verdict

The C63 AMG is a genuine performance icon across all three generations. The W204 M156 is a naturally aspirated masterpiece with well-documented weaknesses — head bolt failure (pre-2011) and camshaft/lifter wear. The W205 M177 is a twin-turbo V8 with a hot-vee design, suffering from ignition coil failures and cooling system issues. The W206 M139l is a hybridised four-cylinder that delivers astonishing power but lacks the character of its V8 predecessors. Buy on history, maintain on schedule, and any C63 will reward you with one of the most engaging driving experiences available.

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Buying Checklist

Before you buy a used Mercedes-AMG C63 (or before you commit to an engine replacement), check these:

1. Cold Start (M156) — Listen for ticking from the top of the engine (camshaft/lifter warning) and clicking (head bolt warning on pre-2011 cars)

2. Service History — including which generation (W204, W205 or W206) and evidence of major maintenance

3. Engine Number (W204) — Check if it's above #60658 (revised head bolts)

4. Coolant Level — Any unexplained loss? (head bolt or cooling system warning)

5. Oil Level — Is the oil level rising? (coolant mixing with oil — head bolt failure warning)

6. Ignition Coil History (W205) — Has the recall been completed?

7. Misfire Codes (W205) — Any stored codes? (ignition coil or injector issues)

8. Hybrid System Health (W206) — Any warnings or reduced power? (complex system — ensure warranty)

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

This table's rows match Section 1B's Era Map exactly — three engine families across the C63's history.

M156 (early)

Years2007–2011

Power451–518 hp

2025 Enquiries[PATTERN DATA]

Avg. Recon Cost£5,000–£8,500 [MB-QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M156 (early)2007–2011451–518 hp[PATTERN DATA]£5,000–£8,500 [MB-QUOTE]

M156 (late)2011–2014451–518 hp[PATTERN DATA]£5,000–£8,500 [MB-QUOTE]

M1772014–2018469–503 hp[PATTERN DATA]£6,000–£10,000 [MB-QUOTE]

M177 (updated)2018–2021469–503 hp[PATTERN DATA]£6,500–£11,000 [MB-QUOTE]

M139l + PHEV2021–present671 hp[PATTERN DATA]£10,000–£15,000 [MB-QUOTE]

Technical Specs

M177 — 4.0 V8 BiTurbo

Displacement6,208cc (6.2‑litre)

CylindersV8

Compression Ratio11.3:1

Fuel SystemMulti-point fuel injection

ValvetrainDOHC, 4 valves per cylinder, variable valve timing

ConstructionHand-built "one man, one engine"

Displacement3,982cc (4.0‑litre)

CylindersV8

Compression Ratio10.5:1

Fuel SystemDirect injection

TurbochargerTwin-turbo (hot-vee design)

ConstructionHand-built "one man, one engine"

→ Compare C63 AMG engine prices for your Mercedes

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Market Intelligence

Most Common Failure

M156: Head bolt failure (pre-2011) and camshaft/lifter wear / M177: Ignition coil failure / M139l: Hybrid system complexity — the defining risks of each generation

Average Enquiry Mileage

M156: 50,000–90,000 miles / M177: 40,000–70,000 miles / M139l: 10,000–30,000 miles【PATTERN DATA】

Average Replacement Cost

M156: £5,000–£8,500 / M177: £6,000–£11,000 / M139l: £10,000–£15,000 reconditioned, supply only【MB-QUOTE】

Most Requested Engine Code

M156 — the naturally aspirated V8 icon【PATTERN DATA】

Peak Enquiry Season

Spring — performance car season【PATTERN DATA】

Regional Demand

London22%

South East18%

South West (14%)【PATTERN DATA】

Regional Demand Breakdown

22%London

18%South East

Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty — always confirm terms with your chosen supplier.

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