How much does a Mercedes‑Benz GLC63 AMG engine replacement cost in the UK?

A reconditioned GLC63 AMG engine typically costs £6,500–£10,000 supply only, with the GLC63 S variant at the higher end. Fitting adds £1,000–£1,800 depending on the specialist. A full engine replacement on a Mercedes can range from £9,000 to £13,000. Use our calculator for a figure specific to your GLC‑Class.

What are the common problems with the Mercedes‑Benz GLC63 AMG?

The most common issues are oil separator failure (leading to rear main seal leaks — whistling noise, oil leaks, unstable idle), ignition coil failure (misfires, rough running), intercooler coolant leaks (coolant loss, misfires), timing chain wear (rattling on cold start), oil leaks from valve cover gaskets and timing covers, and carbon buildup on intake valves (rough idle, poor fuel economy).

Is it worth replacing a GLC63 AMG engine, or should I scrap the car?

Depends on the vehicle value and condition. Against a well‑kept GLC63 AMG worth £35,000–£60,000+, a £7,000–£9,000 recon is 15–20% of the car's value — often worth it for a cherished example. The GLC63 AMG is a desirable performance SUV, and engine replacement is a significant but justifiable investment for a well‑maintained example. Against a tired example with significant body or drivetrain issues, the same recon may be less justifiable — get a specialist valuation first.

How do I find my Mercedes‑Benz GLC63 AMG engine code?

The engine code is M177.980, found on the VIN plate and in the vehicle documentation. It's the 4.0‑litre twin‑turbo V8 fitted to the GLC63 AMG X253/C253 from 2017–2022. The engine is handcrafted by AMG in Affalterbach. The GLC63 produces 476 hp; the GLC63 S produces 503 hp.

Can I repair the M177 oil separator, or does the engine need replacement?

The oil separator must be replaced if it's failing — it's a critical component of the crankcase ventilation system. A failing oil separator can cause excessive crankcase pressure or vacuum, leading to rear main seal failure and other oil leaks. A preventative replacement costs £1,500–£4,000. Ignoring it can lead to £10K+ in engine repairs. At the first sign of whistling noises, unstable idle, or oil leaks, book an inspection immediately.

Mercedes‑Benz GLC‑Class GLC63 AMG2017–20221 Engine Generation

Mercedes‑Benz GLC‑Class GLC63 AMG Engine Replacement — Compare Prices & Get Quotes

Name: Mercedes-Benz GLC63 AMG UK Engine Enquiry Data 2025
Creator: MercedesEngine.uk

Get quotes today from trusted UK Mercedes‑Benz GLC63 AMG specialists. Compare reconditioned, rebuilt and used 4.0‑litre twin‑turbo V8 engines — M177 variants across the X253 and C253 generations — supply & fit available nationwide.

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Mercedes‑Benz GLC63 AMG Engines — from £2,500 to £12,000Engine code: M177.980

Mercedes‑Benz GLC63 AMG Engines — from £2,500 to £12,000· Engine code: M177.980

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The GLC63 AMG THROUGH TIME — Era Map

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

Era Note

4.0L twin‑turbo V8 — 476 hp, 650 Nm; M177 is one of AMG's most celebrated engines; oil separator, ignition coils and timing chain are the critical watch items

GenerationYearsEngine CodeReliabilityRecon CostEra Note

GLC63 AMG X253/C253 BMW 320d GLC63 AMG X253/C253

2017–2019M177.980★★★☆☆ [NEWLY ASSIGNED — see Data Note]£6,500–£10,000 [PLACEHOLDER — confirm vs cost sheet]4.0L twin‑turbo V8 — 476 hp, 650 Nm; M177 is one of AMG's most celebrated engines; oil separator, ignition coils and timing chain are the critical watch items

GLC63 S AMG X253/C253 BMW 320d GLC63 S AMG X253/C253

2019–2022M177.980★★★☆☆ [NEWLY ASSIGNED — see Data Note]£7,500–£12,000 [PLACEHOLDER — confirm vs cost sheet]4.0L twin‑turbo V8 — 503 hp, 700 Nm; hot‑inside‑V turbo layout; oil separator failure, ignition coil and intercooler coolant leaks are the primary concerns

Why use this era map?

This table is the single source every other section on this page matches — Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes‑Benz GLC63 AMG Engine Replacement Costs

Supply Only£6,500–£10,000

Fitted (Indie)£7,500–£11,500

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,500–£5,000£3,300–£6,2001–6 monthsBudget priority; vehicle under £20,000

Reconditioned Engine£6,500–£10,000£7,500–£11,50012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£8,500–£12,000£9,500–£13,50012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£14,000–£18,000£15,500–£20,00024–36 monthsInsurance jobs, warranty claims

Figures above reflect current GLC63 AMG replacement costs. The GLC63 S variant typically sits at the higher end of the range. See the Era Map above for generation‑specific pricing.

Labour estimate: Fitting a GLC63 AMG engine typically takes 14–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

→ Compare GLC63 AMG engine prices from UK specialists

Common Problems

1. Oil Separator & Rear Main Seal Failure (All M177 — Critical)

2. Ignition Coil Failure (All M177 — Common)

3. Intercooler Coolant Leaks (All M177)

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GLC‑Class GLC63 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.

GLC‑Class GLC63 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 SenseOil separator failure (preventative)✅ Yes£1,500–£4,000Essential maintenance — catch before rear main seal failsRear main seal failure (from oil separator)✅ Yes£2,000–£5,000Labour‑intensive but essential — prevents oil lossIgnition coil failure✅ Yes£800–£2,000Replace all eight coils — prevent misfire damageIntercooler coolant leak✅ Yes£800–£2,500Catch it early — before coolant damages the engineTiming chain wear (preventative)✅ Yes£2,000–£5,000Essential maintenance — catch before catastrophic failureSnapped timing chain❌ Usually NoEngine replacementPiston‑valve contact means little is left to repairSevere oil starvation or overheating❌ Usually NoEngine replacementReplacement cost justified on high‑value examples

Buying This GLC63 AMG? Check These First

Buy If

Full Mercedes service history with regular oil changes (critical for M177 longevity)
No oil leaks from the rear of the engine (oil separator and rear main seal health)
No misfires or rough running (ignition coil health)
No coolant loss or sweet smells (intercooler coolant leak warning)
No cold‑start rattling (timing chain health)
Still under factory or extended warranty — GLC63 repairs are expensive
Post‑2019 facelift with updated components

Avoid If

Oil leaks from the rear of the engine — oil separator or rear main seal may be failing
Misfires or rough running — ignition coils may be failing
Unexplained coolant loss — intercooler coolant leak may be developing
Cold‑start rattling and no timing chain history — budget for chain work
No service history — the M177 is unforgiving of neglect
Any history of engine failure or major repairs without documentation

Closing Verdict

The GLC63 AMG is Mercedes‑Benz's fire‑breathing V8 SUV — a 4.0‑litre twin‑turbo M177 engine producing up to 503 hp and 700 Nm torque. It's one of AMG's most celebrated engines, delivering serious power and performance. However, as these vehicles accumulate mileage, several expensive problems can emerge. The most critical is oil separator failure, which often leads to rear main seal leaks — a repair that can cost thousands. Ignition coil failure is also common, with coils failing at as little as 40,000 miles. Intercooler coolant leaks are another known issue that can cause catastrophic engine damage if ignored. The M177 is sensitive to neglected maintenance. With typical GLC63 values ranging from £35,000 to £60,000+, an engine replacement is a major financial commitment — a well‑maintained example with full service history and an active warranty is the safest choice.

Don't guess.Get the right engine at the right price.

→ Compare GLC63 AMG engine prices before you buy

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Buying Checklist

Before you buy a used Mercedes‑Benz GLC‑Class GLC63 AMG (or before you commit to an engine replacement), check these:

Oil Leaks — Check for oil around the transmission bellhousing and rear of the engine (oil separator / rear main seal warning) — see the map above

Cold Start — Listen for rattling or clattering (timing chain tensioner warning)

Misfires — Check for smooth idle; any misfires may indicate ignition coil failure

Coolant System — Check for sweet smells, unexplained coolant loss (intercooler coolant leak warning)

Service History — Including regular oil changes (critical for M177 longevity)

Ignition Coils — Check for any history of coil replacement (common failure)

Warranty Status — Check if the vehicle still has a transferable warranty — GLC63 repairs are expensive

Engine Warning Light — Have codes read; unresolved issues may indicate ignition, timing, oil separator or sensor problems

MOT History — Check for emissions‑related failures

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.

M177.980

Years2017–2019 (GLC63)

Power476 hp @ 5,500–6,250rpm

2025 Enquiries— (pattern data)

Avg. Recon Cost£6,500–£10,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M177.9802017–2019 (GLC63)476 hp @ 5,500–6,250rpm— (pattern data)£6,500–£10,000 [PLACEHOLDER]

M177.9802019–2022 (GLC63 S)503 hp @ 5,500–6,250rpm— (pattern data)£7,500–£12,000 [PLACEHOLDER]

Technical Specs

M177.980 — GLC63 AMG

Displacement3,982cc (4.0L)

Cylinders8‑cylinder V8, 90° V‑angle

Engine MaterialAluminium‑alloy block and heads

Bore × Stroke83.0mm × 92.0mm

Compression Ratio10.5:1

Fuel SystemDirect injection, twin‑turbocharged (hot‑inside‑V layout)

Valves32 valves, DOHC

Torque (GLC63)650 Nm @ 1,750–4,500 rpm

Torque (GLC63 S)700 Nm @ 1,750–4,500 rpm

→ Compare GLC63 AMG engine prices for your GLC‑Class

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Market Intelligence

Most Common Failure

Oil separator / rear main seal failure — the most frequent GLC63 AMG engine enquiry

Average Enquiry Mileage

30,000

–60,000 miles

[PATTERN DATA]

Average Replacement Cost

£7,000

–£9,000 reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

M177.980

[PATTERN DATA]

Peak Enquiry Season

Year‑round — M177 maintenance is a constant consideration

Regional Demand

South East19%

South West16%

Midlands14%

PATTERN DATA

Regional Demand Breakdown

19%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 condition, 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.

Why UK Mercedes‑Benz GLC63 AMG Owners Trust MercedesEngine.uk

Trusted GLC63 AMG Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real GLC63 AMG owners, as part of the Engine Finders network, covering the M177.980 across the X253 and C253 generations.
Compare GLC63 AMG Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit. We cover the 4.0‑litre twin‑turbo V8 specifically, with specialists who understand the oil separator vulnerabilities, ignition coil issues, intercooler coolant leaks, and the unique requirements of the GLC63 AMG.
UK Engine Replacement Services for GLC63 AMG
supply‑only or full supply & fit available nationwide, covering every generation of this badge since 2017, with a 12‑month warranty as standard across our network.

Find the best Mercedes‑Benz GLC63 AMG engine replacement UK owners rely on. Compare prices from trusted specialists on EnginesMarket today and keep your V8 SUV on the road with confidence.

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12-Month Warranty

As standard

Nationwide Delivery

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