Engines Market

Mercedes G 65 AMG Specialists

Mercedes Benz G Class G 65 AMG Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz G Class G 65 AMG engine specialists. Compare prices on reconditioned, rebuilt and used M279 V12 twin-turbo engines - supply & fit available nationwide for this ultra-rare AMG flagship.

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Mercedes Benz G Class G 65 AMG Engine
from£15,000 to £25,0...
  • Usedfrom £8,500
  • Reconditionedfrom £12,000
  • Common codesM279.982
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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 G Class G 65 AMG Engine History & Specs at a Glance

The Mercedes Benz G 65 AMG represents the absolute pinnacle of G-Class engine offerings - a twin-turbocharged 6.0-litre V12 that transformed the boxy off-roader into a 630hp luxury performance icon. With fewer than 500 units produced globally, the G 65 AMG remains one of the rarest and most coveted G-Class variants ever built.

Mercedes Benz G Class G 65 AMG
  1. 2012

    G 65 AMG introduced, M279.982 6.0L V12 twin-turbo, 604hp (612 PS), 1,001Nm torque, 7-speed AMG SPEEDSHIFT PLUS

  2. 2015

    Power output increased to 621hp (630 PS / 463kW), 1,001Nm torque, US market launch

  3. 2015

    2018 - Production continues with V12 unchanged, 7G-TRONIC transmission, full-time 4WD

  4. 2018

    G 65 AMG Final Edition produced (65 units), featuring bronze 21-inch wheels, marking the end of V12 G-Class production

The M279 V12 engine fitted to the Mercedes Benz G Class G 65 AMG is covered below, with UK rebuilt pricing and known failure points from real owner experience of this ultra-rare powerplant.

Engine Codes & Pricing

Mercedes Benz G Class G 65 AMG Engine Codes Specifications & Replacement Cost

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

M279.982 — 6.0L V12 Twin-Turbo (2012-2018) engine

M279.982 — 6.0L V12 Twin-Turbo (2012-2018)

Power Output
604-621 hp (450-463 kW)
Torque
1,001 Nm (738 lb-ft) @ 2,300-4,300 rpm
Displacement
5,980cc (6.0L)
Configuration
V12, twin-turbocharged, DOHC with variable valve timing
Compression Ratio
9.0:1
Years Fitted
2012-2018

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Common Problems

Mercedes Benz G Class G 65 AMG Engine Problems Repair Cost vs Replacement

The Mercedes Benz G Class G 65 AMG relies on the M279 V12 twin-turbo - an engine of extraordinary complexity and capability. While fundamentally robust when properly maintained, the V12's intricate systems have developed well-documented reputations for specific, expensive failures. Turbocharger failure, intercooler leaks, ignition coil degradation, and oil leaks dominate replacement demand. 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 65 AMG engine failures, what they cost to fix, and when replacement is the smarter financial decision.

Common failure points and repair options

M279 Turbocharger Failure

Affected
Mercedes Benz G Class G 65 AMG (M279.982, 2012-2018)
Typical failure mileage
40,000 - 70,000 miles
Root cause
The twin-turbocharged V12 generates immense heat, which can cause oil seals to degrade and turbocharger bearings to wear prematurely. Excessive heat, oil contamination, or worn-out seals cause the turbos to fail. When this happens, owners may notice a loss of power, excessive smoke from the exhaust, or a loud whining noise from the engine bay. Vacuum lines and wastegate actuators also tend to wear out over time, affecting turbo performance.

Repair options

Repair tierDealer priceSpecialist price
Minor - Turbo Seal & Actuator Repair£2,500-£3,500£1,500-£2,500
Major - Twin Turbocharger Replacement£6,000-£9,000£4,000-£6,000
Full Replacement - Rebuilt Engine£25,000-£35,000£15,000-£25,000
Our recommendation
On a G 65 AMG worth £80,000-£150,000+, specialist turbocharger repair at £1,500-£2,500 is the obvious first step if caught early. Dealer pricing is significantly 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.
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M279 Intercooler & Cooling System Failures

Affected
Mercedes Benz G Class G 65 AMG (M279.982, 2012-2018)
Typical failure mileage
30,000 - 60,000 miles
Root cause
The G 65 AMG produces immense power, generating excessive heat that places the cooling system under constant stress. Intercooler leaks reduce the efficiency of the turbo system, causing reduced boost pressure, sluggish acceleration, and increased fuel consumption. Radiator leaks (the radiator is made with a mix of aluminium and plastic that degrades over time) and water pump failure are also common.

Repair options

Repair tierDealer priceSpecialist price
Minor - Coolant System Inspection & Thermostat£600-£1,000£400-£700
Major - Intercooler Replacement£3,000-£4,500£2,000-£3,000
Major - Radiator & Water Pump Replacement£2,500-£3,500£1,800-£2,500
Full Replacement - Rebuilt Engine£25,000-£35,000£15,000-£25,000
Our recommendation
The cooling system on the M279 V12 is critical to engine longevity. If you notice reduced boost pressure, sluggish acceleration, or coolant loss, have the intercoolers and cooling system inspected immediately. Specialist replacement is significantly cheaper than dealer pricing and far less expensive than a full engine rebuild. Don't ignore coolant loss - overheating a V12 can cause catastrophic engine damage.
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M279 Ignition Coil & Oil Leak Problems

Affected
Mercedes Benz G Class G 65 AMG (M279.982, 2012-2018)
Typical failure mileage
40,000 - 80,000 miles
Root cause
The V12's ignition coils are exposed to significant heat from the engine and can fail, leading to misfires, poor fuel consumption, and a lack of power. Oil leaks from degraded seals and gaskets are also common on higher-mileage V12 engines. Carbon buildup in the intake system due to direct fuel injection causes rough idling, power loss, and misfires.

Repair options

Repair tierDealer priceSpecialist price
Minor - Ignition Coil Replacement (Set of 12)£1,500-£2,500£900-£1,500
Minor - Intake Valve Cleaning£800-£1,200£500-£800
Intermediate - Full Top-End Reseal£3,000-£4,500£2,000-£3,000
Full Replacement - Rebuilt Engine£25,000-£35,000£15,000-£25,000
Our recommendation
The M279 V12's ignition coils are a known weak point due to heat exposure. Replacing all 12 coils as a preventative measure at 60,000 miles is recommended - doing individual coils as they fail leads to repeated workshop visits and potential engine damage from misfires. For oil leaks, address them early; V12 oil leaks can quickly become expensive if left unchecked.
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Don't Let Engine Failure Write Off Your Mercedes Benz G Class G 65 AMG

A failed V12 engine doesn't have to mean the end of your G 65 AMG. Whether you're dealing with turbocharger failure, intercooler leaks, ignition coil issues, or oil leaks, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Benz G Class specialists. Every rebuilt M279 V12 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 65 AMG Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz G Class G 65 AMG owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes Benz G Class G 65 AMG V12 Engine Prices Today

Comparing quotes for your Mercedes Benz G Class G 65 AMG engine replacement is completely free and carries no obligation - enter your registration above, receive tailored prices from UK specialists who know the M279 V12 twin-turbo engine 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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