Mercedes GLS350dEngine Rebuild— From £2,800
Specialist Mercedes GLS350d 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 GLS350d Engine
Vehicle
Mercedes GLS350d
Model
GLS
Variant
GLS350d
Fuel
Diesel
Engine
OM642
Capacity
3.0L V6
Generation
X166 (2015–2019)
Rebuild From
£2,800
Not sure which engine you have?
The GLS350D 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 GLS350dEngine Rebuild Price
Starting From £2,800
Engine Code
OM642Rebuild From
£2,800
Generation
X166 (2015–2019)
Exact price depends on condition and parts required — submit your reg for a fixed-price quote.
Mercedes GLS350d Swirl Flap & Injector Wear
If your GLS350d is an X166 generation model (2015 to 2019) with the OM642 diesel V6 — swirl flap and injector wear is a well-documented pattern on this engine, backed by multiple manufacturer technical service bulletins. We replace worn swirl flaps, injector seals and the timing chain as standard on every OM642 rebuild.
include_in_hero_hook: yes for X166/OM642 — Source: established specialist pattern with multiple TSBs, per VRF-mercedes-gls.md. Applies to X166 generation only; X167 mainstream range not independently confirmed this session.
Source: established specialist pattern with multiple TSBs, per VRF-mercedes-gls.md. Applies to X166 generation only; X167 mainstream range not independently confirmed this session
Mercedes GLS350dENGINE OPTIONS
Every GLS350D is different. That's why we offer the right solution for your engine, your car and your budget.
REBUILDING YOUR GLS350D ENGINE
We rebuild the engine your GLS350D 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 GLS350D 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 GLS350D ENGINES
Restoring your existing engine to full working condition rather than replacing it outright. Our rebuild service covers this.
Learn moreREMANUFACTURED GLS350D ENGINES
Built to original specification with updated components. That's consistent with what our rebuild service delivers on the M256.
Learn moreREPLACEMENT GLS350D 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 GLS350D 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 GLS350D, 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 GLS350d rebuild looks like.
Mercedes GLS350d ENGINE REBUILD PROCESS
WHAT MERCEDES GLS350D OWNERS SAY
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm your GLS350D has the M256, along with an exact rebuild price.
WHY MERCEDES GLS350D OWNERS CHOOSE US
Engine matched using VIN or registration number
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 GLS350d
RECOVERY
Mercedes GLS 63
DIAGNOSTICS
Mercedes GLS
STRIPPED ENGINE
Mercedes GLS S
TIMING CHAIN REPLACEMENT
Mercedes GLS350d
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 GLS350D 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 GLS350D ENGINE
The GLS350d was introduced with the X166 generation of the GLS (originally badged as the GL-Class) and remained in production from 2015 to 2019. It uses the OM642 — a 3.0-litre V6 diesel that served across a wide range of Mercedes models of that era. The GLS350d was discontinued when the X167 generation arrived in 2019, replaced in the lineup by the GLS400d with its newer OM656 inline-six diesel. The OM642 is a proven, well-understood engine with known wear patterns — which means we know exactly what to check and what to replace on every rebuild.
We continue to rebuild and replace M256 engines for every GLS350D on the road.
MERCEDES GLS350D ENGINE CODES
M256 (R190, 2023–present)
A 3.0-litre inline-six petrol mild-hybrid engine fitted to the GLS350D 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 GLS350DMERCEDES GLS350D ENGINE COMPATIBILITY
Because the GLS350d uses a single engine code across its entire production run, compatibility is straightforward — every X166-generation GLS350d has the OM642. However, getting the right replacement parts, ancillaries and engine management calibration still depends on your exact build year and specification. 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 GLS350D APPLICATIONS BY GENERATION
Generation
Chassis
Years
Engine Code
Fuel
MERCEDES GLS350D ENGINES BY YEAR
From the R190's launch in 2023, the GLS350D 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 GLS350D 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 GLS350D MODEL YEAR:
Mercedes GLS350d
2015 Engine Rebuild
Mercedes GLS350d
2016 Engine Rebuild
Mercedes GLS350d
2017 Engine Rebuild
Mercedes GLS350d
2018 Engine Rebuild
Mercedes GLS350d
2019 Engine Rebuild
If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg.
MERCEDES GLS350D ENGINE COSTS
A Mercedes GLS350d engine rebuild starts from
£2,800
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 GLS350D ENGINE SIZES
• Mercedes GLS350d 3.0 Litre Engine (M256, I6)
MERCEDES GLS350D FUEL TYPES
• Mercedes GLS350d 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.