Mercedes Benz G Class G 55 AMG Engine ReplacementCompare 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.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £5,500 to £9,000
Used from £2,500 · Reconditioned from £4,500 · Common codes: M113.982, M113.993
From £2,500
Tested, bare/short engine
From £4,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Mercedes Benz G Class G 55 AMG Replacement Engineto Finding the Best Mercedes Benz G Class G 55 AMG Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryMercedes 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.
Variant HistoryMercedes 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
Fuel TypePetrol
Engine Size5.4L (5,439cc)
Power Output Range476-500hp across the variant's historyEngine History Timeline
G 55 AMG Kompressor launched as standard catalogue model M113K 5.4L supercharged V8, 476hp (350kW), 5-speed 722.6 automatic
Power output increased to 500hp (373kW) torque 700Nm, improved supercharger calibration
Facelift with revised styling continued 500hp output
G 55 AMG replaced by G 63 AMG with M157 twin-turbo V8 ending the supercharged V8 era
Key Specs Snapshot
Fuel TypePetrolEngine Size5.4L (5,439cc)Power Output Range476-500hp across the variant's historyTorque700Nm (516 lb-ft)Years Produced2004-2012Every 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.
Mercedes Benz G Class G 55 AMG Engine Codes - Specifications & Replacement CostMercedes Benz G Class G 55 AMG Engine Codes - Specifications & Replacement Cost
5.4L Supercharged V8 (2004-2006)
Power Output476 hp (350 kW) @ 6,100 rpmTorque700 Nm @ 2,750-4,000 rpmYears Fitted2004-2006
Compatible Trim Levels
- G 55 AMG Kompressor (early production)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£2,500-£4,200
Reconditioned
Addressed known issues, tested
£4,500-£6,500
Rebuilt
Full teardown, upgraded internals
£5,500-£8,000
Common Failure
The M113K's supercharger electromagnetic clutch can fail, leading to loss of boost pressure and reduced engine performance. Worn supercharger bearings causing whining noise are also reported.
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.
Why the G 55 AMG Loses Boost and Power
Affected Vehicles
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.
Why It Happens
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.
Dealer (parts + labour)
£1,200-£1,800
Specialist (parts + labour)
£700-£1,100
What it involves
Replace electromagnetic clutch assembly, inspect belt and tensioner
Suitability
50k-80k miles; excellent value if caught early
1 - 2 daysDealer (parts + labour)
£2,500-£3,500
Specialist (parts + labour)
£1,500-£2,200
What it involves
Full supercharger strip-down, new bearings, clutch, seals, and pulley
Suitability
80k-120k miles; recommended if whining noise present
1 - 2 daysDealer (parts + labour)
£10,000-£14,000
Specialist (parts + labour)
£5,500-£9,000
What it involves
Supply & fit rebuilt M113K with rebuilt supercharger, upgraded components
Suitability
Full long-block warranty; required for catastrophic failure
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Minor - Supercharger Clutch Replacement Minor | £1,200-£1,800 | £700-£1,100 | Replace electromagnetic clutch assembly, inspect belt and tensioner | 50k-80k miles; excellent value if caught early | 1 - 2 days |
 Intermediate - Supercharger Rebuild Best Value | £2,500-£3,500 | £1,500-£2,200 | Full supercharger strip-down, new bearings, clutch, seals, and pulley | 80k-120k miles; recommended if whining noise present | 1 - 2 days |
Full Replacement - Rebuilt Engine Best Value | £10,000-£14,000 | £5,500-£9,000 | Supply & fit rebuilt M113K with rebuilt supercharger, upgraded components | Full long-block warranty; required for catastrophic failure | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical G 55 AMG is worth £15,000-£45,000 depending on condition and mileage【INDUSTRY ESTIMATE】. The full replacement cost of £5,500-£9,000 is modest relative to vehicle value for most examples, making a specialist rebuilt engine excellent value for preservation. For vehicles worth under £12,000, evaluate repair options first.
Our Recommendation
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.
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.
Compare rebuilt M113K Mercedes Benz G Class G 55 AMG engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Mercedes Benz G Class G 55 AMG. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Mercedes Benz G Class G 55 AMG Engine ReplacementFrequently Asked Questions
Question 1How much does it cost to replace a Mercedes G Class G 55 AMG engine in the UK-
A Mercedes G Class G 55 AMG engine replacement typically costs between £5,500 and £9,000 depending on condition type and whether fitting is included. M113K supercharged V8 units range from £5,500 to £9,000 supply only.
- Rebuilt M113K (G 55 AMG): £5,500-£9,000 supply only
- Reconditioned units: £4,500-£7,000
- Used engines from breakers: £2,500-£4,800 but higher risk
- Labour for supply & fit adds £800-£1,500 to any engine price
Question 2What are the signs of M113K supercharger failure in a G 55 AMG-
The M113K's supercharger system has several warning signs before complete failure.
- Loss of power or reduced boost pressure
- Whining or grinding noise from the supercharger
- Supercharger clutch not engaging (no boost under acceleration)
- Belt slippage or unusual belt noise
Question 3Is the M113K engine in the G 55 AMG reliable-
The M113K is considered one of the most robust German performance engines. However, the supercharger system requires attention at higher mileages.
- Supercharger clutch and bearings are the main weak points
- Oil leaks from valve cover gaskets are common
- The engine block and internals are exceptionally durable
- With preventative maintenance, 150,000+ miles is realistic
Question 4Should I repair or replace my G 55 AMG engine-
Repair if the failure is isolated (e.g., supercharger clutch, valve cover gaskets, transmission valve body). Replace if there's bottom end damage, bore scoring, or catastrophic supercharger failure that has sent debris through the engine.
- Supercharger clutch replacement: £700-£1,100 - excellent value if caught early
- Valve cover gasket replacement: £350-£550 - good preventative maintenance
- Full M113K rebuild: £5,500-£9,000 - for catastrophic failure or 150k+ miles
- Given G 55 AMG values (£15,000-£45,000), a rebuilt engine is typically good value
Question 5How do I know which engine code my G 55 AMG has-
Check your vehicle log book (V5C) for the engine number, which includes the engine code prefix.
- V5C log book shows full engine number with code prefix
- Engine code stamped on cylinder block (visible from under vehicle)
- G 55 AMG (2004-2006): M113.982 (476hp)
- G 55 AMG (2006-2012): M113.993 (500hp)
- Service history documents list engine type
Question 6Can I fit a used G 55 AMG engine myself-
We strongly advise against DIY fitting on a G 55 AMG. The complex 4MATIC system, supercharger plumbing, gearbox alignment, and ECU coding requirements demand specialist equipment and expertise.
- 4MATIC transfer case alignment requires specialist knowledge
- Supercharger system requires precise reassembly
- ECU coding and immobiliser synchronisation needed
- Specialist supply & fit costs £800-£1,500 - worth every penny
Question 7What warranty comes with a reconditioned G 55 AMG engine-
Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty, with many specialists offering 24-month coverage on M113K rebuilds. This includes parts and labour for any manufacturing defect or installation error.
- 12-month unlimited mileage is the minimum standard
- M113K rebuilds often include 24-month warranty
- All warranties cover parts, labour, and MOT compliance
- Extended warranties available at point of purchase
Why Choose UsCompare Mercedes Benz G Class G 55 AMG Supercharged V8Engine PricesToday
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12-Month Warranty on every rebuilt G 55 AMG engine
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