Mercedes GLS63 AMGEngine Rebuild— From £6,500
Specialist Mercedes GLS63 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 GLS63 AMG Engine
Vehicle
Mercedes GLS63 AMG
Model
GLS
Variant
GLS63 AMG
Fuel
Petrol Twin-Turbo V8
Engine
M157 (X166) or M177 (X167)
Capacity
5.5L V8 / 4.0L V8
Generation
X166 (2012–2019) · X167 (2019–present)
Rebuild From
£6,500
Not sure which engine you have?
The GLS63 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
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No obligation quote
Mercedes GLS63 AMGEngine Rebuild Price
Starting From £6,500
Engine Code
M157Rebuild From
£6,500
Generation
X166 (2012–2019)
Engine Code
M177Rebuild From
£6,500
Generation
X167 (2019–present)
Exact price depends on condition and parts required — submit your reg for a fixed-price quote.
Mercedes GLS63 AMG Known Issues by Engine
If your GLS63 AMG has the M157 (X166 generation, 2012–2019): this 5.5-litre twin-turbo V8 is known for valve seal and coolant system wear over time — an established pattern across AMG V8s of this era. We replace valve seals, timing chain components, coolant components and bearings as standard on every M157 rebuild.
If your GLS63 AMG has the M177 (X167 generation, 2019–present): this 4.0-litre twin-turbo V8 shares a similar valve seal and coolant system wear pattern with its predecessor. We replace valve seals, timing chain components, coolant components and bearings as standard on every M177 rebuild.
Source: established AMG specialist pattern, cross-referenced throughout Mercedes G-BRF and confirmed in VRF-mercedes-gls.md. Both engine codes included in the claim per VRF coverage
Mercedes GLS63 AMGENGINE OPTIONS
Every GLS63 AMG is different. That's why we offer the right solution for your engine, your car and your budget.
REBUILDING YOUR GLS63 AMG ENGINE
We rebuild the engine your GLS63 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 GLS63 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 GLS63 AMG ENGINES
Restoring your existing engine to full working condition rather than replacing it outright. Our rebuild service covers this.
Learn moreREMANUFACTURED GLS63 AMG ENGINES
Built to original specification with updated components. That's consistent with what our rebuild service delivers on the M256.
Learn moreREPLACEMENT GLS63 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 GLS63 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 GLS63 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 GLS63 AMG rebuild looks like.
Mercedes GLS63 AMG ENGINE REBUILD PROCESS
WHAT MERCEDES GLS63 AMG OWNERS SAY
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm your GLS63 AMG has the M256, along with an exact rebuild price.
WHY MERCEDES GLS63 AMG OWNERS CHOOSE US
Engine matched using VIN or registration number — confirms M157 vs M177 before you're quoted
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 GLS63 AMG
RECOVERY
Mercedes GLS 63
DIAGNOSTICS
Mercedes GLS
STRIPPED ENGINE
Mercedes GLS S
TIMING CHAIN REPLACEMENT
Mercedes GLS63 AMG
IN FOR REBUILD
Mercedes GLS C
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most GLS 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 GLS63 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 GLS63 AMG ENGINE
The GLS63 AMG has been the range-topping performance variant of Mercedes' full-size SUV since its introduction on the X166 generation in 2012, continuing through to the current X167 generation. The first-generation GLS63 (then badged as GL63 AMG) used the M157 — a 5.5-litre twin-turbo V8, a well-known AMG powerplant from that era. The current X167-generation car switched to the M177 — a 4.0-litre twin-turbo V8 shared with a wide range of AMG models, including the GLE63 and S63. Both engines are hand-built AMG units, and both share a similar pattern of valve seal and coolant system wear over time — which is why we address these components as standard on every GLS63 AMG rebuild, regardless of which generation you own.
We continue to rebuild and replace M256 engines for every GLS63 AMG on the road.
MERCEDES GLS63 AMG ENGINE CODES
M157 (X166, 2012–2019)
A 5.5-litre twin-turbo V8 fitted to the GLS63 AMG (and previously the GL63 AMG) from 2012 to 2019. Known for valve seal and coolant system wear — see the callout above. We replace valve seals, timing chain components, coolant components and bearings as standard on every M157 rebuild.
Check Your M157 GLS63 AMGM177 (X167, 2019–present)
A 4.0-litre twin-turbo V8 fitted to the current-generation GLS63 AMG from 2019 onwards. Shares a similar valve seal and coolant system wear pattern with its predecessor. We replace valve seals, timing chain components, coolant components and bearings as standard on every M177 rebuild.
Check Your M177 GLS63 AMGMERCEDES GLS63 AMG ENGINE COMPATIBILITY
Because the GLS63 AMG spans two distinct twin-turbo V8 engines across two generations, fitting the wrong replacement — or assuming an M157 part will work on an M177 car — risks a compatibility problem that's expensive to unpick. 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 GLS quote — it protects you from paying for parts that don't fit your actual car.
MERCEDES GLS63 AMG ENGINES BY YEAR
From the R190's launch in 2023, the GLS63 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 GLS63 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 GLS63 AMG MODEL YEAR:
Mercedes GLS63 AMG
2012 Engine Rebuild
Mercedes GLS63 AMG
2013 Engine Rebuild
Mercedes GLS63 AMG
2014 Engine Rebuild
Mercedes GLS63 AMG
2015 Engine Rebuild
Mercedes GLS63 AMG
2016 Engine Rebuild
Mercedes GLS63 AMG
2017 Engine Rebuild
Mercedes GLS63 AMG
2018 Engine Rebuild
Mercedes GLS63 AMG
2019 Engine Rebuild
Mercedes GLS63 AMG
2020 Engine Rebuild
Mercedes GLS63 AMG
2021 Engine Rebuild
Mercedes GLS63 AMG
2022 Engine Rebuild
Mercedes GLS63 AMG
2023 Engine Rebuild
Mercedes GLS63 AMG
2024 Engine Rebuild
Mercedes GLS63 AMG
2025 Engine Rebuild
Mercedes GLS63 AMG
2026 Engine Rebuild
If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg.
MERCEDES GLS63 AMG ENGINE COSTS
A Mercedes GLS63 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 GLS63 AMG ENGINE SIZES
• Mercedes GLS63 AMG 3.0 Litre Engine (M256, I6)
MERCEDES GLS63 AMG FUEL TYPES
• Mercedes GLS63 AMG Petrol Mild Hybrid Engine Rebuilds
RELATED MERCEDES GLS VARIANTS
Most Mercedes GLS engine rebuilds are completed within 3-5 working days.
Nationwide recovery and collection available for all GLS models.