Mercedes GLC300dEngine Rebuild— From £2,200
Specialist Mercedes GLC300d 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 GLC300d Engine
Vehicle
Mercedes GLC300d
Model
GLC-Class
Variant
GLC300d
Fuel
Diesel
Engine
OM651 (early X253) or OM654 (later X253/X254)
Capacity
2.0L–2.1L I4
Generation
X253 (2015–2022) · X254 (2022–present)
Rebuild From
£2,200
Not sure which engine you have?
The GLC300D 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 GLC300dEngine Rebuild Price
Starting From £2,200
Engine Code
OM651Rebuild From
£2,200
Generation
X253 (early, 2015–2018)
Engine Code
OM654Rebuild From
£2,200
Generation
X253 (later, 2018–2022) / X254 (2022–present)
Exact price depends on condition and parts required — submit your reg for a fixed-price quote.
Mercedes GLC300d Injector Seal & Timing Chain Wear (Early X253, OM651)
If your GLC300d is an early X253-generation model with the OM651 diesel — roughly 2015 to 2018 — injector seal leaks and timing chain wear is a well-documented pattern on this engine, shared with the C-Class family of that era. We replace injector seals, timing chain components and gaskets as standard on every OM651 rebuild.
The later X253 models (from around 2018) and the current X254 generation use a different engine, the OM654, which doesn't share this specific issue — it's a separate, more recent design.
Source: established specialist pattern, per VRF-mercedes-glc-class.md. OM654 explicitly excluded from this claim per VRF, correctly scoped to early X253 generation
Mercedes GLC300dENGINE OPTIONS
Every GLC300D is different. That's why we offer the right solution for your engine, your car and your budget.
REBUILDING YOUR GLC300D ENGINE
We rebuild the engine your GLC300D 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 GLC300D 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 GLC300D ENGINES
Restoring your existing engine to full working condition rather than replacing it outright. Our rebuild service covers this.
Learn moreREMANUFACTURED GLC300D ENGINES
Built to original specification with updated components. That's consistent with what our rebuild service delivers on the M256.
Learn moreREPLACEMENT GLC300D 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 GLC300D 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 GLC300D, 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 GLC300d rebuild looks like.
Mercedes GLC300d ENGINE REBUILD PROCESS
WHAT MERCEDES GLC300D OWNERS SAY
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm your GLC300D has the M256, along with an exact rebuild price.
WHY MERCEDES GLC300D OWNERS CHOOSE US
Engine matched using VIN or registration number — confirms OM651 vs OM654 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 GLC300d
RECOVERY
Mercedes GLC-Class 63
DIAGNOSTICS
Mercedes GLC-Class
STRIPPED ENGINE
Mercedes GLC-Class S
TIMING CHAIN REPLACEMENT
Mercedes GLC300d
IN FOR REBUILD
Mercedes GLC-Class C
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most GLC-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 GLC300D 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 GLC300D ENGINE
The GLC300d has been part of the GLC-Class range since the model launched in 2015. Early X253-generation cars (roughly 2015 to 2018) use the OM651 — a 2.1-litre four-cylinder diesel shared with the C-Class family of that era. From around 2018, the GLC300d switched to the OM654, a newer 2.0-litre four-cylinder diesel that continues into the current X254 generation. Knowing which one your car has matters, because the known wear pattern and the rebuild specifics differ between them — which is exactly why we confirm your exact engine by registration before quoting.
We continue to rebuild and replace M256 engines for every GLC300D on the road.
MERCEDES GLC300D ENGINE CODES
OM651 (Early X253)
A 2.1-litre four-cylinder diesel fitted to early GLC300d models from 2015 to around 2018 (X253 generation). Known for injector seal leaks and timing chain wear — see the callout above. We replace injector seals, timing chain components and gaskets as standard on every OM651 rebuild.
Check Your OM651 GLC300dOM654 (Later X253 / X254)
A 2.0-litre four-cylinder diesel fitted from around 2018 onwards, continuing into the current X254 generation. A newer design that doesn't share the earlier engine's injector seal and timing chain pattern. We service it to the same standard as our other GLC300d rebuilds.
Check Your OM654 GLC300dMERCEDES GLC300D ENGINE COMPATIBILITY
Because the GLC300d spans two distinct engines across two generations, fitting the wrong replacement — or assuming an OM651 part will work on an OM654 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 GLC-Class quote — it protects you from paying for parts that don't fit your actual car.
MERCEDES GLC300D ENGINES BY YEAR
From the R190's launch in 2023, the GLC300D 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 GLC300D 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 GLC300D MODEL YEAR:
Mercedes GLC300d
2015 Engine Rebuild
Mercedes GLC300d
2016 Engine Rebuild
Mercedes GLC300d
2017 Engine Rebuild
Mercedes GLC300d
2018 Engine Rebuild
Mercedes GLC300d
2019 Engine Rebuild
Mercedes GLC300d
2020 Engine Rebuild
Mercedes GLC300d
2021 Engine Rebuild
Mercedes GLC300d
2022 Engine Rebuild
Mercedes GLC300d
2023 Engine Rebuild
Mercedes GLC300d
2024 Engine Rebuild
Mercedes GLC300d
2025 Engine Rebuild
Mercedes GLC300d
2026 Engine Rebuild
If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg.
MERCEDES GLC300D ENGINE COSTS
A Mercedes GLC300d engine rebuild starts from
£2,200
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 GLC300D ENGINE SIZES
• Mercedes GLC300d 3.0 Litre Engine (M256, I6)
MERCEDES GLC300D FUEL TYPES
• Mercedes GLC300d Petrol Mild Hybrid Engine Rebuilds
RELATED MERCEDES GLC-CLASS VARIANTS
Most Mercedes GLC-Class engine rebuilds are completed within 3-5 working days.
Nationwide recovery and collection available for all GLC-Class models.