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

Get quotes today from trusted UK Mercedes Benz GLC Class GLC63 AMG engine specialists. Compare prices on reconditioned, rebuilt and used engines for the hand-built 4.0-litre twin-turbo V8 - supply & fit available nationwide.

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Mercedes Benz GLC Class GLC63 Engine
from£7,000 to £14,00...
  • Usedfrom £4,000
  • Reconditionedfrom £6,500
  • Common codesM177.980
Mercedes Benz glc-class GLC63 Used Engine — M177.980Mercedes Benz glc-classUsed Engine — M177.980Mercedes Benz glc-class GLC63 Reconditioned Engine — M177.980Mercedes Benz glc-classReconditioned Engine — M177.980Mercedes Benz glc-class GLC63 Rebuilt Engine — M177.980Mercedes Benz glc-classRebuilt Engine — M177.980

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Mercedes Benz GLC Class GLC63 Engine History & Specs at a Glance

The GLC63 AMG launched in 2017 as the flagship performance variant of the X253 GLC range. Powered by the hand-built M177 4.0-litre twin-turbo V8 - shared with the C63 and AMG GT - it held the title of the world's fastest SUV when it went on sale. In 2024, the second-generation X254 GLC63 replaced the V8 with a 2.0-litre four-cylinder plug-in hybrid producing 671hp - more power, but a very different character.

Mercedes Benz GLC Class GLC63
  1. 2017

    M177.980, 4.0L twin-turbo V8, 476hp (GLC63 4MATIC+, X253/C253)

  2. 2017

    M177.980, 4.0L twin-turbo V8, 510hp (GLC63 S 4MATIC+, X253/C253)

  3. 2019

    Facelift X253/C253; M177 continues with 476hp and 510hp outputs unchanged

  4. 2022

    X253 GLC63 production ends; V8 discontinued

  5. 2024

    M139l PHEV, 2.0L four-cylinder with plug-in hybrid, 671hp (X254 GLC63 S E Performance)

Every engine fitted to the Mercedes Benz GLC Class GLC63 is covered below, with UK rebuilt pricing and known failure points - from M177 oil separator and rear main seal issues to M139l PHEV reliability questions.

Engine Codes & Pricing

Mercedes Benz GLC Class GLC63 Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

M177.980 — 4.0L Twin-Turbo V8 (2017-2022) engine

M177.980 — 4.0L Twin-Turbo V8 (2017-2022)

Power Output
476 hp (350 kW) @ 5,500-6,250 rpm (GLC63); 510 hp (375 kW) @ 5,500-6,250 rpm (GLC63 S)
Torque
650 Nm @ 1,750-4,500 rpm (GLC63); 700 Nm @ 1,750-4,500 rpm (GLC63 S)
Years Fitted
2017-2022
Displacement
3,982cc
Cylinders
V8, 32-valve, DOHC, twin-turbocharged

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Common Problems

Mercedes Benz GLC Class GLC63 Engine Problems Repair Cost vs Replacement

The GLC63's M177 twin-turbo V8 is one of AMG's most impressive modern engines - a hand-built masterpiece that delivers serious power and performance. However, as these vehicles accumulate mileage, a small number of well-documented issues can drive significant repair costs. The most frequent and expensive problem is oil separator failure, which often leads to rear main seal leaks. Every rebuilt engine supplied through EnginesMarket includes upgraded components addressing the original failure point, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

M177 Oil Separator Failure & Rear Main Seal Leak

Affected
Mercedes GLC63 AMG 4MATIC+ (M177.980, 2017-2022)
Typical failure mileage
40,000-80,000 miles
Root cause
The oil separator (part of the crankcase ventilation system) fails, causing unbalanced crankcase pressure. Excessive positive pressure forces oil past engine seals, or excessive negative pressure (vacuum) pulls seals inward, distorting them. The rear main seal - sitting at the back of the crankshaft where the engine meets the transmission - is often the first to fail. Symptoms include oil dripping from the rear of the engine, oil around the transmission bellhousing, or a burning oil smell.

Repair options

Repair tierDealer priceSpecialist price
Diagnosis - Oil separator check£150-£300£100-£200
Intermediate - Oil separator replacement£800-£1,200£500-£800
Major - Rear main seal replacement£2,500-£4,000£1,800-£2,800
Full Replacement - Rebuilt M177 engine with upgraded components£12,000-£18,000£8,500-£14,000
Our recommendation
The oil separator is the root cause of most M177 rear main seal leaks. If you notice oil around the transmission bellhousing or a burning oil smell, have the crankcase pressure checked immediately. A simple test - attempting to remove the oil fill cap at idle - can reveal excessive vacuum (cap difficult to remove) or excessive pressure (air release). If caught early, replacing the oil separator alone (£500-£800 at a specialist) prevents the much more expensive rear main seal replacement. If the rear main seal has already failed, replacing both the seal and the oil separator together is the only sensible approach. On a GLC63 worth £35,000-£60,000, the full rebuilt engine route is justifiable if bottom-end damage has occurred.
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M177 Ignition Coil & Fuel Injector Issues

Affected
Mercedes GLC63 AMG 4MATIC+ (M177.980, 2017-2022)
Typical failure mileage
30,000-70,000 miles
Root cause
The M177 can suffer from ignition coil failures and fuel injector leakage, causing misfires and check engine lights. Raw fuel can damage catalytic converters if not addressed promptly.

Repair options

Repair tierDealer priceSpecialist price
Minor - Ignition coil replacement£400-£700£300-£500
Intermediate - Fuel injector replacement£800-£1,500£600-£1,000
Full Replacement - Rebuilt M177 engine£12,000-£18,000£8,500-£14,000
Our recommendation
Ignition coil and fuel injector issues on the M177 are usually straightforward to diagnose and repair. If you experience a misfire or check engine light, have a specialist perform a cylinder contribution test and fuel trim analysis. Replace ignition coils in pairs or as a full set to avoid repeat failures. If fuel injector leakage is confirmed, replace the affected injector(s) and change the engine oil and spark plugs immediately. Ignoring fuel injector leakage can lead to catalytic converter damage and, in extreme cases, bore wash and cylinder scoring - at which point a full engine replacement becomes the only option.
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M177 Turbocharger Failure

Affected
Mercedes GLC63 AMG 4MATIC+ (M177.980, 2017-2022)
Typical failure mileage
50,000-90,000 miles
Root cause
The M177's twin-scroll turbochargers are mounted in the hot-vee configuration, subjecting them to high temperatures. Oil starvation, often caused by oil separator failure or neglected oil changes, can lead to turbocharger bearing failure.

Repair options

Repair tierDealer priceSpecialist price
Minor - Turbocharger inspection & oil supply check£200-£400£150-£300
Major - Single turbocharger replacement£2,500-£4,000£1,800-£3,000
Major - Both turbochargers replacement£4,500-£7,000£3,500-£5,500
Full Replacement - Rebuilt M177 engine£12,000-£18,000£8,500-£14,000
Our recommendation
Preventative maintenance is the key to avoiding M177 turbocharger failure. Use only Mercedes-spec oil (MB 229.5) and change it every 10,000 miles or 12 months - never stretch the interval. If you hear a high-pitched whistle, notice a loss of power, or see blue smoke from the exhaust, have the turbochargers inspected immediately. If one turbo has failed, replace both - the other will typically fail within a short period due to shared oil supply and similar operating conditions.
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Don't Let Oil Separator Failure, Rear Main Seal Leaks, or Turbocharger Issues Write Off Your Mercedes GLC63

Whether you're facing M177 oil separator failure on your V8 GLC63 or considering the long-term reliability of the new M139l PHEV, EnginesMarket makes it simple to compare quotes from trusted UK Mercedes AMG specialists. Every rebuilt engine in our network carries upgraded components addressing the original design weakness - plus a minimum 12-month unlimited mileage warranty with nationwide delivery and supply & fit options. Don't pay main dealer premiums. Compare prices from independent AMG specialists who know these hand-built V8 engines inside out.

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FAQ

Mercedes Benz GLC Class GLC63 Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz GLC Class GLC63 owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes GLC Class GLC63 Engine Prices Today

Comparing quotes for your Mercedes GLC63 AMG is completely free, with no obligation and no pressure. Enter your registration above to get tailored quotes from UK Mercedes AMG specialists who understand the M177 V8 and M139l PHEV inside out. Whether you need a used engine, a reconditioned unit, or a full rebuilt engine with upgraded oil separator and rear main seal components, we'll connect you with the right specialist for your exact GLC63 - with a minimum 12-month warranty on every engine supplied.

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