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Mercedes G 63 AMG Specialists

Mercedes Benz G Class G 63 AMG Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz G Class G 63 AMG engine specialists. Compare prices on reconditioned, rebuilt and used M157 and M177 twin-turbo V8 engines - supply & fit available nationwide.

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Mercedes Benz G Class G 63 AMG Engine
from£6,995 to £15,00...
  • Usedfrom £3,500
  • Reconditionedfrom £5,800
  • Common codesM157.984, M177.980
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Variant History

Mercedes Benz G Class G 63 AMG Engine History & Specs at a Glance

The Mercedes Benz G 63 AMG represents the pinnacle of G-Class performance, evolving from the 5.5-litre M157 twin-turbo V8 in the W463 generation to the 4.0-litre M177 twin-turbo V8 in the current W464 platform - each hand-built by AMG and delivering supercar-rivalling power from a boxy off-road icon.

Mercedes Benz G Class G 63 AMG
  1. 2012

    G 63 AMG launched with M157.984 5.5L twin-turbo V8, 544hp, 760Nm, 7-speed AMG SPEEDSHIFT PLUS 7G-TRONIC

  2. 2015

    G 63 AMG 6x6 produced (2013-2015), M157 5.5L twin-turbo V8, 536hp

  3. 2018

    All-new W464 G 63 AMG introduced with M177.980 4.0L twin-turbo V8, 585hp, 850Nm, 9-speed AMG SPEEDSHIFT TCT

  4. 2024

    W464 facelift, M177 gains 48V mild-hybrid system with 20hp electric boost

Every twin-turbo V8 engine fitted to the Mercedes Benz G Class G 63 AMG is covered below, with UK rebuilt pricing and known failure points from real owner experience.

Engine Codes & Pricing

Mercedes Benz G Class G 63 AMG Engine Codes Specifications & Replacement Cost

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

M157.984 — 5.5L Twin-Turbo V8 (2012-2018) engine

M157.984 — 5.5L Twin-Turbo V8 (2012-2018)

Power Output
544 hp @ 5,500 rpm
Torque
760 Nm @ 2,000-5,000 rpm
Displacement
5,461cc
Years Fitted
2012-2018

Can’t find your exact engine code?-> Get quotes for M157 Mercedes Benz G Class G 63 AMG engine replacement

-> Get quotes for M157 Mercedes Benz G Class G 63 AMG engine replacement

Common Problems

Mercedes Benz G Class G 63 AMG Engine Problems Repair Cost vs Replacement

The Mercedes Benz G Class G 63 AMG relies on two of AMG's most celebrated twin-turbo V8s - the M157 and M177. While both are engineering masterpieces, they have developed well-documented reputations for specific, predictable failures. Turbo actuator failure on the M157 and oil separator failure on the M177 dominate replacement demand, while timing chain wear and oil consumption affect both families. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common G 63 AMG engine failures, what they cost to fix, and when replacement is the smarter financial decision.

Common failure points and repair options

M157 Turbo Actuator Failure

Affected
Mercedes Benz G Class G 63 AMG (M157.984, 2012-2018)
Typical failure mileage
45,000 - 70,000 miles
Root cause
The electronic turbo actuator (A1570940001) suffers internal gear and sensor degradation, causing the wastegate to stop responding - typically triggering limp mode and a check engine light. The high boost pressure and extreme heat generated by the twin turbos put significant stress on the actuator components.

Repair options

Repair tierDealer priceSpecialist price
Minor - Actuator Replacement (Single Turbo)£1,200-£1,800£600-£950
Major - Both Actuators & Turbo Service£3,000-£4,500£1,800-£2,800
Full Replacement - Rebuilt Engine£14,000-£18,000£6,995-£12,000
Our recommendation
On an AMG G 63 worth £35,000-£80,000, specialist actuator replacement at £600-£950 is the obvious first step. Dealer pricing is inflated for this repair. However, if the failure has caused turbo debris to enter the engine (metal particles in oil), you must go straight to full engine replacement - ignoring this risks complete bottom end failure within 1,000 miles.
-> Compare rebuilt M157 Mercedes Benz G Class G 63 AMG engine prices

M177 Oil Separator & Rear Main Seal Failure

Affected
Mercedes Benz G Class G 63 AMG (M177.980, 2018-present)
Typical failure mileage
40,000 - 80,000 miles
Root cause
The oil separator system can fail, creating excessive crankcase pressure or vacuum that damages the rear main seal. This leads to oil leaks that can cost thousands to repair and may require weeks in the workshop. Proper crankcase pressure balance is critical to the long-term health of the M177 engine.

Repair options

Repair tierDealer priceSpecialist price
Minor - Oil Separator Replacement£800-£1,200£500-£800
Major - Rear Main Seal & Oil Separator£2,500-£3,500£1,500-£2,200
Full Replacement - Rebuilt Engine£15,000-£20,000£8,500-£15,000
Our recommendation
The oil separator failure on the M177 is one of the most expensive common repairs. If you notice oil spots under your G 63 AMG or a burning oil smell, have the oil separator and rear main seal inspected immediately. Ignoring this can lead to catastrophic engine failure. Specialist repair at £1,500-£2,200 is significantly better value than dealer pricing.
-> Compare rebuilt M177 Mercedes Benz G Class G 63 AMG engine prices

M157 / M177 Timing Chain Wear

Affected
Mercedes Benz G Class G 63 AMG (M157.984, 2012-2018; M177.980, 2018-present)
Typical failure mileage
60,000 - 120,000 miles
Root cause
On early M157 engines (2011-2012), oil drainage from the cylinder head on start-up causes brief oil starvation of the timing chain tensioner, leading to chain stretch. Later M157 engines (2013+) received revised tensioners and check valves. The M177 can also suffer from timing chain stretch, with a rattling noise at startup being the primary symptom.

Repair options

Repair tierDealer priceSpecialist price
Minor - Tensioner & Check Valve£800-£1,200£450-£750
Major - Full Timing Chain Set£3,500-£5,000£2,000-£3,500
Full Replacement - Rebuilt Engine£14,000-£20,000£6,995-£15,000
Our recommendation
Early M157 G 63 AMG owners (2012 models) should have the timing chain tensioner and check valve inspected as a priority - the updated components from 2013 onwards address the oil drainage issue. If you hear a rattling noise on cold start that lasts more than 2 seconds, book a specialist inspection immediately. Ignoring timing chain issues on an AMG V8 can result in complete engine destruction.
-> Compare rebuilt M157 or M177 Mercedes Benz G Class G 63 AMG engine prices

M177 Intercooler Leaks

Affected
Mercedes Benz G Class G 63 AMG (M177.980, 2018-present)
Typical failure mileage
30,000 - 60,000 miles
Root cause
The engine-mounted water-to-air intercoolers on the M177 can develop internal leaks, leading to coolant loss, misfires, and even catastrophic engine damage. This is a critical failure point that requires immediate attention.

Repair options

Repair tierDealer priceSpecialist price
Major - Intercooler Replacement£2,500-£3,500£1,500-£2,500
Full Replacement - Rebuilt Engine£15,000-£20,000£8,500-£15,000
Our recommendation
The M177 intercooler leak is one of the most critical issues affecting the current G 63 AMG. If you notice coolant loss without an external leak, have the intercoolers inspected immediately. Specialist replacement is significantly cheaper than dealer pricing and far less expensive than a full engine rebuild.
-> Compare rebuilt M177 Mercedes Benz G Class G 63 AMG engine prices

Don't Let Engine Failure Write Off Your Mercedes Benz G Class G 63 AMG

A failed twin-turbo V8 doesn't have to mean the end of your G 63 AMG. Whether you're dealing with an M157 turbo actuator failure, M177 oil separator failure, timing chain wear, or intercooler leaks, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Benz G Class specialists. Every rebuilt M157 and M177 engine in our network includes upgraded components designed to address the original failure point, a minimum 12-month unlimited mileage warranty, and nationwide delivery with supply & fit options available.

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FAQ

Mercedes Benz G Class G 63 AMG Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz G Class G 63 AMG owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes Benz G Class G 63 AMG Twin-Turbo V8 Engine Prices Today

Comparing quotes for your Mercedes Benz G Class G 63 AMG engine replacement is completely free and carries no obligation - enter your registration above, receive tailored prices from UK specialists who know the M157 and M177 twin-turbo V8 engines inside out, and get back on the road with confidence. Every rebuilt engine is backed by a minimum 12-month unlimited mileage warranty.

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