Mercedes G55 AMGEngine Rebuild— From £6,500
Specialist Mercedes G55 AMG engine rebuilds and replacements, with registration-based engine matching, nationwide recovery and a 12-month unlimited-mileage warranty
Rated Mercedes Engine Specialists — 1,800+ Engines Rebuilt
Specialist technicians with 10-15 years of experience
12 Month Unlimited-Mileage Warranty
Nationwide Recovery
Free Engine Matching by Registration
M256 Specialists
Your Mercedes G55 AMG Engine
Vehicle
Mercedes G55 AMG
Model
G-Class
Variant
G55 AMG
Fuel
Petrol Supercharged
Engine
M113 (supercharged / Kompressor)
Capacity
5.4L–5.5L V8
Generation
W463 (1999–2011)
Rebuild From
£6,500
Not sure which engine you have?
The G55 AMG uses the M256 3.0-litre inline-six mild-hybrid engine — enter your registration below and we'll confirm your exact spec before you get a quote.
DVLA & VIN verified
100% secure & private
No obligation quote
Mercedes G55 AMGEngine Rebuild Price
Starting From £6,500
Engine Code
M113 (supercharged)Rebuild From
£6,500
Generation
W463 (1999–2011)
Exact price depends on condition and parts required — submit your reg for a fixed-price quote.
Mercedes G55 AMG Oil Leaks & Coolant System Wear (M256 I6)
The M256 is a sophisticated 3.0-litre inline-six with an integrated starter-generator and electric auxiliary compressor — a more modern and efficient design than the older M276 V6. We replace timing chains, bearings, water pump and gaskets as standard on every M256 rebuild.
Because the G55 AMG uses a completely different engine family from the V8 M178 fitted to the G-Class 63 and GT 63 S, parts and rebuild specifications don't cross over between them.
Source: Established M256 specialist pattern — timing chain, bearing and gasket wear across integrated-starter-generator inline-six units.
Mercedes G55 AMGENGINE OPTIONS
Every G55 AMG is different. That's why we offer the right solution for your engine, your car and your budget.
REBUILDING YOUR G55 AMG ENGINE
We rebuild the engine your G55 AMG already has instead of selling you a used engine of unknown history — strip it down, pressure-test it, and replace every worn or damaged component (timing chains, bearings, water pump, gaskets) with updated OEM parts. Near-new performance with a 12-month unlimited-mileage warranty.
From £3,200RECONDITIONED G55 AMG ENGINES
A full strip-down, inspection and replacement of worn parts rather than a straight swap. If that's what you're after, our rebuild service is exactly that.
Learn moreREFURBISHED G55 AMG ENGINES
Restoring your existing engine to full working condition rather than replacing it outright. Our rebuild service covers this.
Learn moreREMANUFACTURED G55 AMG ENGINES
Built to original specification with updated components. That's consistent with what our rebuild service delivers on the M256.
Learn moreREPLACEMENT G55 AMG ENGINES
If your existing engine is beyond economical repair, we offer complete engine replacement and fitting – sourced and fitted by our team, with the same 12-month warranty.
Learn moreUSED G55 AMG ENGINES
Matched low-mileage used engines for when time is critical. We source and fit these too, but most owners choose a rebuild once they understand the compatibility risks.
Learn moreNOT SURE WHICH OPTION IS RIGHT FOR YOU?
Enter your registration below and we'll confirm your M256 and talk you through the best solution for your G55 AMG, honestly.
Ask About Your Options
OUR WORKSHOP
01RECOVERY COLLECTION
02M256 ENGINE STRIPPED FOR REBUILD INSPECTION
03VALVE COVERS & COOLANT COMPONENT WORK
04TECHNICIANS AT WORK
05ENGINE TESTING (RIG)
06COMPLETED & READY FOR REFIT
Real photos from our workshop — not stock imagery. This is what a genuine Mercedes G55 AMG rebuild looks like.
Mercedes G55 AMG ENGINE REBUILD PROCESS
WHAT MERCEDES G55 AMG OWNERS SAY
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm your G55 AMG has the M256, along with an exact rebuild price.
WHY MERCEDES G55 AMG OWNERS CHOOSE US
Engine matched using VIN or registration number — confirms your exact M113 supercharged V8 spec
Genuine specialist workshop — not a broker
Specialist technicians with 10-15 years of experience
We don't swap your engine for an unknown used unit
Nationwide recovery, workshop rebuild
12 month unlimited-mileage warranty
All engine ancillaries serviced as part of the rebuild
Trade & public enquiries welcome
Dedicated advisor from quote to fit
OUR MOST RECENTMERCEDES RECOVERIES & REBUILDS
Real vehicles brought into our workshop. Open bonnets, stripped blocks, and cars ready for collection — this is what genuine engine work looks like.
Mercedes G55 AMG
RECOVERY
Mercedes G-Class 63
DIAGNOSTICS
Mercedes G-Class
STRIPPED ENGINE
Mercedes G-Class S
TIMING CHAIN REPLACEMENT
Mercedes G55 AMG
IN FOR REBUILD
Mercedes G-Class C
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most G-Class models are recovered within a few hours of booking. Most rebuilds are completed within 3-5 working days.
Workshop slots fill up fast — book your recovery today.
LOOKING FOR A USED ORREPLACEMENT ENGINEINSTEAD?
We supply low-mileage, VIN-matched used units too, and offer full replacement and fitting. However, most G55 AMG owners choose a rebuild once they realise it removes compatibility risk and works out more cost-effective over the life of the car.
Enter your reg below — we'll show you every option, honestly.
ABOUT THE MERCEDES G55 AMG ENGINE
The G55 AMG was the original AMG‑modified G‑Class, produced across the W463 generation from 1999 to 2011. It uses the M113 supercharged V8 — a 5.4‑litre to 5.5‑litre unit with a belt‑driven supercharger, officially called the Kompressor on Mercedes models of that era. Unlike later twin‑turbo G63s, the G55 AMG's M113 is a naturally‑aspirated M113 block with a supercharger added, giving it a distinctive power delivery and a simpler top‑end layout than the later bi‑turbo V8s. The G55 AMG was eventually replaced by the twin‑turbo G63 AMG in 2012, but remains a highly sought‑after classic‑era AMG G‑Class.
We continue to rebuild and replace M256 engines for every G55 AMG on the road.
MERCEDES G55 AMG ENGINE CODES
M256 (R190, 2023–present)
A 3.0-litre inline-six petrol mild-hybrid engine fitted to the G55 AMG from 2023 to present. The M256 features an integrated starter-generator (ISG) and electric auxiliary compressor, making it a more modern and efficient design than the older M276 V6. We replace timing chains, bearings, water pump and gaskets as standard on every M256 rebuild.
Check Your M256 G55 AMGMERCEDES G55 AMG ENGINE COMPATIBILITY
The G55 AMG's M113 supercharged V8 is unique to this specific G‑Class variant within the AMG range — it's not the same as the later M157 or M177 twin‑turbo units, and not the same as the naturally‑aspirated M113 found in other Mercedes models. Before we quote or supply anything, we confirm:
Your exact engine code (M256) via registration or VIN
Your generation (R190)
Drivetrain and ancillary specification
Any electronics or ECU considerations specific to your exact build
This is why we always start with your registration rather than a generic G-Class quote — it protects you from paying for parts that don't fit your actual car.
MERCEDES G55 AMG APPLICATIONS BY GENERATION
Generation
Chassis
Years
Engine Code
Fuel
MERCEDES G55 AMG ENGINES BY YEAR
From the R190's launch in 2023, the G55 AMG has used the M256 3.0-litre inline-six mild hybrid throughout. If you're unsure of your exact spec, we'll confirm it before you book.
The M256 has been fitted to every G55 AMG since launch — if your registration year isn't listed above, get in touch and we'll confirm availability directly against your reg.
WE COVER EVERY MERCEDES G55 AMG MODEL YEAR:
Mercedes G55 AMG
1999 Engine Rebuild
Mercedes G55 AMG
2000 Engine Rebuild
Mercedes G55 AMG
2001 Engine Rebuild
Mercedes G55 AMG
2002 Engine Rebuild
Mercedes G55 AMG
2003 Engine Rebuild
Mercedes G55 AMG
2004 Engine Rebuild
Mercedes G55 AMG
2005 Engine Rebuild
Mercedes G55 AMG
2006 Engine Rebuild
Mercedes G55 AMG
2007 Engine Rebuild
Mercedes G55 AMG
2008 Engine Rebuild
Mercedes G55 AMG
2009 Engine Rebuild
Mercedes G55 AMG
2010 Engine Rebuild
Mercedes G55 AMG
2011 Engine Rebuild
If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg.
MERCEDES G55 AMG ENGINE COSTS
A Mercedes G55 AMG engine rebuild starts from
£6,500
A full replacement engine and fitting service is also available. Exact pricing depends on the condition of your existing engine and the parts required — submit your registration for a fixed-price quote within 30 minutes.
12 MONTH
UNLIMITED-MILEAGE
WARRANTY
MERCEDES G55 AMG ENGINE SIZES
• Mercedes G55 AMG 3.0 Litre Engine (M256, I6)
MERCEDES G55 AMG FUEL TYPES
• Mercedes G55 AMG Petrol Mild Hybrid Engine Rebuilds
RELATED MERCEDES G-CLASS VARIANTS
Most Mercedes G-Class engine rebuilds are completed within 3-5 working days.
Nationwide recovery and collection available for all G-Class models.