Engines Market

Mercedes G 55 AMG Specialists

Mercedes Benz G Class G 55 AMG Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz G Class G 55 AMG engine specialists. Compare prices on reconditioned, rebuilt and used M113K supercharged V8 engines - supply & fit available nationwide.

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Mercedes Benz G Class G 55 AMG Engine
from£5,500 to £9,000
  • Usedfrom £2,500
  • Reconditionedfrom £4,500
  • Common codesM113.982, M113.993
Mercedes Benz g-class G 55 AMG Used Engine — M113.982Mercedes Benz g-classUsed Engine — M113.982Mercedes Benz g-class G 55 AMG Reconditioned Engine — M113.982Mercedes Benz g-classReconditioned Engine — M113.982Mercedes Benz g-class G 55 AMG Rebuilt Engine — M113.982Mercedes Benz g-classRebuilt Engine — M113.982

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3 Simple Steps to Finding the Right Replacement Engine

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Variant History

Mercedes Benz G Class G 55 AMG Engine History & Specs at a Glance

The Mercedes Benz G 55 AMG represented the first factory-built AMG G-Class, transforming the boxy off-roader into a supercharged V8 performance icon. Powered by the M113K Kompressor engine, it defined AMG's G-Class lineage from 2004 to 2012.

Mercedes Benz G Class G 55 AMG
  1. 2004

    G 55 AMG Kompressor launched as standard catalogue model, M113K 5.4L supercharged V8, 476hp (350kW), 5-speed 722.6 automatic

  2. 2006

    Power output increased to 500hp (373kW), torque 700Nm, improved supercharger calibration

  3. 2008

    Facelift with revised styling, continued 500hp output

  4. 2012

    G 55 AMG replaced by G 63 AMG with M157 twin-turbo V8, ending the supercharged V8 era

Every supercharged V8 engine fitted to the Mercedes Benz G Class G 55 AMG is covered below, with UK rebuilt pricing and known failure points from real owner experience.

Engine Codes & Pricing

Mercedes Benz G Class G 55 AMG Engine Codes Specifications & Replacement Cost

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

M113.982 — 5.4L Supercharged V8 (2004-2006) engine

M113.982 — 5.4L Supercharged V8 (2004-2006)

Power Output
476 hp (350 kW) @ 6,100 rpm
Torque
700 Nm @ 2,750-4,000 rpm
Years Fitted
2004-2006

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Common Problems

Mercedes Benz G Class G 55 AMG Engine Problems Repair Cost vs Replacement

The Mercedes Benz G Class G 55 AMG relies on the M113K supercharged V8 - a fundamentally robust engine that has developed a well-documented reputation for specific, predictable failures. The supercharger clutch is the most common failure point driving replacement demand, while oil leaks and supercharger bearing wear also feature prominently. 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 55 AMG engine failures, what they cost to fix, and when replacement is the smarter financial decision.

Common failure points and repair options

M113K Supercharger Clutch Failure

Affected
Mercedes Benz G Class G 55 AMG (M113.982, M113.993, 2004-2012)
Typical failure mileage
50,000 - 80,000 miles
Root cause
The electromagnetic clutch that engages and disengages the supercharger can fail, leading to a loss of boost pressure and reduced engine performance. The supercharger bearings also wear out over time, causing a whining noise and eventual failure.

Repair options

Repair tierDealer priceSpecialist price
Minor - Supercharger Clutch Replacement£1,200-£1,800£700-£1,100
Intermediate - Supercharger Rebuild£2,500-£3,500£1,500-£2,200
Full Replacement - Rebuilt Engine£10,000-£14,000£5,500-£9,000
Our recommendation
At the first sign of power loss or abnormal whining from the supercharger, have the clutch and bearings inspected. The specialist clutch replacement at £700-£1,100 is excellent value if caught early. If the supercharger has been whining for some time, budget for the full rebuild route - ignoring bearing wear risks catastrophic supercharger failure that can send debris through the engine.
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M113K Oil Leaks

Affected
Mercedes Benz G Class G 55 AMG (M113.982, M113.993, 2004-2012)
Typical failure mileage
60,000 - 100,000 miles
Root cause
The M113K engine is prone to oil leaks from valve cover gaskets that harden and crack over time, oil cooler seal degradation, and front crankshaft seal leaks that can contaminate the serpentine belt.

Repair options

Repair tierDealer priceSpecialist price
Minor - Valve Cover Gasket Replacement (Both Sides)£600-£900£350-£550
Intermediate - Full Top-End Reseal£1,200-£1,800£750-£1,200
Full Replacement - Rebuilt Engine£10,000-£14,000£5,500-£9,000
Our recommendation
Oil leaks on the M113K are rarely urgent but should not be ignored - oil dripping onto the exhaust manifolds can create smoke and, in extreme cases, fire risk. The specialist valve cover gasket replacement at £350-£550 is cost-effective and should last 80k+ miles. If you're already addressing one leak, consider doing the full top-end reseal - the labour overlaps significantly.
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722.6 Transmission Valve Body Issues

Affected
Mercedes Benz G Class G 55 AMG (M113.982, M113.993, 2004-2012)
Typical failure mileage
80,000 - 120,000 miles
Root cause
The 5-speed 722.6 automatic transmission's valve body and conductor plate can develop wear, causing delayed gear shifts, harsh shifting, and solenoid failure. The torque converter can also fail, leading to shuddering and slipping.

Repair options

Repair tierDealer priceSpecialist price
Minor - Valve Body Service£800-£1,200£500-£800
Major - Torque Converter & Valve Body£2,500-£3,500£1,500-£2,200
Full Replacement - Rebuilt Engine & Transmission£12,000-£16,000£6,500-£10,000
Our recommendation
The 722.6 transmission is generally reliable but benefits from regular fluid changes every 60,000 miles. At the first sign of harsh shifting or delayed engagement, have the valve body inspected - the specialist conductor plate and solenoid replacement at £500-£800 is far cheaper than a full transmission rebuild. Don't ignore torque converter shudder; it can cause debris that damages the entire transmission.
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Don't Let Engine Failure Write Off Your Mercedes Benz G Class G 55 AMG

A failed supercharged V8 doesn't have to mean the end of your G 55 AMG. Whether you're dealing with a supercharger clutch failure, oil leaks, or transmission issues, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Benz G Class specialists. Every rebuilt M113K 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 55 AMG Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz G Class G 55 AMG owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

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Comparing quotes for your Mercedes Benz G Class G 55 AMG engine replacement is completely free and carries no obligation - enter your registration above, receive tailored prices from UK specialists who know the M113K supercharged V8 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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