M256 ENGINEREBUILD & REPLACEMENT
Specialist Mercedes-Benz M256 3.0-litre straight-six petrol mild-hybrid engine rebuilds and replacements. Fitted across the AMG GT, C-Class, E-Class, GLE-Class and GLS. Nationwide recovery, registration-based engine matching, 12-month unlimited-mileage warranty.
Rated Mercedes-Benz 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
Fitted Across 5 Mercedes Models
Starting from
£3,200
Mercedes-AMG M139Engine Specifications
Engine Code
M256
Manufacturer
Mercedes-Benz
Configuration
Inline-6 (I6)
Capacity
3.0L
Fuel
Petrol MHEV
Production Years
2017–present
Used In
5 Mercedes-Benz models
Not sure if your Mercedes has this engine?
Enter your registration and we'll confirm.
Mercedes-AMG M139Engine Rebuild Price
Starting From
£3,200
All M256 applications use the same 2.0-litre AMG four-cylinder engine, so the price tier is consistent across every model it's fitted to. Exact price depends on condition and parts required — submit your reg for a fixed-price quote.
Get Your Fixed-Price Quote →
Mercedes-Benz M256 Applications — Every Model & Variant
Not seeing your exact model?
Send us your registration and we'll confirm.
Mercedes-Benz M256 Rebuild Components
Main bearings and connecting rod bearings
Main bearings and connecting rod bearings
Complete gasket and seal set
Complete gasket and seal set
Timing chain components where required
Timing chain components where required
48V electrical system components
48V electrical system components
Oil filter housing gasket
Oil filter housing gasket
Crankshaft
Crankshaft
Components drawn directly from VRF Key Components data. If your M256's exact ancillary set isn't covered above, we confirm the full scope once your engine is inspected — not guessed in advance.
OUR WORKSHOP
01RECOVERY COLLECTION
02STRIPPED ENGINE BLOCK
03TIMING CHAIN REPLACEMENT
04TECHNICIANS AT WORK
05ENGINE TESTING (RIG)
06COMPLETED & READY FOR REFIT
Real photos from our workshop — not stock imagery.
WHAT MERCEDES-BENZ OWNERS SAY
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm whether your Mercedes has the M256 before you're quoted anything.
WHY CHOOSE US FOR MERCEDES-BENZ M256 REBUILDS
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
Known issues: balance shaft module and piston/bearing defects have been documented on some units; we inspect these as standard during every rebuild.
No widely-reported pattern is confirmed for the M256 — we still recommend a full inspection before any long journey.
AMGMERCEDES-BENZ M256 ENGINE REBUILD PROCESS
OUR MOST RECENTMERCEDES-BENZ 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.
AMG A45 (M256)
RECOVERY
AMG A35 (M260)
DIAGNOSTICS
AMG A45 (M256)
STRIPPED ENGINE
AMG E63 (M177)
TIMING CHAIN REPLACEMENT
AMG C63 (M177)
IN FOR REBUILD
AMG A45 (M256)
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most cars 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.
AMGABOUT THE
MERCEDES-BENZM256 ENGINE
The M256 is Mercedes-Benz's modern 3.0-litre inline-six petrol engine, introduced in 2017. It's a key part of the brand's move to a modular, electrified engine family, featuring an integrated starter-generator (ISG), an electric auxiliary compressor (e-boost), and a 48V mild-hybrid system as standard. It's fitted across five model lines, including the AMG GT 53, C 43 AMG, E 53 AMG, GLE 450, GLE 53 AMG, GLS 450, and GLS 580.
MERCEDES-BENZ M256
APPLICATIONS BY MODEL
The M256 appears in the AMG GT as the GT 53, in the C-Class as the C 43 AMG, and in the E-Class as the E 53 AMG. Across the SUV range, it's the six-cylinder petrol option in the GLE-Class (as both the GLE 450 and GLE 53 AMG) and the GLS (as the GLS 450 and GLS 580). These applications are split across standard and AMG-tuned variants.
MERCEDES-BENZ M256
ENGINE COMPATIBILITY
All M256 applications are 3.0-litre inline-six petrol mild-hybrids. However, standard and AMG variants differ in power output and specific tuning. The specific 48V MHEV system components, including the ISG and e-boost, also vary by application and generation. We confirm compatibility by registration/VIN before quoting any work.
We confirm by registration/VIN before quoting or supplying anything.
MODEL
Confirm your exact model and AMG variant.
GENERATION
Identify the correct generation (W177, C118, H247, W206, X254, R232).
DRIVETRAIN
Specify the variant (45, 45 S, 43).
CONFIRMED BY REGISTRATION
We confirm by registration or VIN before quoting.
AMGOUR WORKSHOP VIEW OF
THE MERCEDES-BENZ M256
Built, rebuilt and tested by engineers who work on Mercedes-Benz engines every day.
Here's our practical view of the M256 across all six model applications.
Note: engine-specific case studies with real job details are not yet included on this page — they'll be added once a documented set of completed M256 rebuilds is available to draw from, rather than filled with placeholder examples now.
A TYPICAL
MERCEDES-BENZ M256 REBUILD
The following describes a typical rebuild scope for this engine — illustrative of the work involved, not a specific customer job. Real case studies from our own completed work will replace this section once available.
*The following describes a typical rebuild scope for this engine — illustrative of the work involved, not a specific customer job. Real case studies from our own completed work will replace this section once available.*
Typical Scope:
Timing chain, bearings, gaskets, balance shaft module inspection, 48V MHEV system ancillaries.
Starting From:
£3,200
AMGMERCEDES-BENZ M256
ENGINE REBUILD COST
A Mercedes-Benz M256 engine rebuild starts from £3,200. 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.
Price Factors: - Extent of internal damage - Balance shaft module condition - Piston/bearing assembly condition - 48V electrical system component condition - Labour required - Parts specification
Starting From
£3,200
MERCEDES-BENZ M256
REBUILD VS REPLACEMENT VS USED
Rebuilding Your M256 Engine
Most engine suppliers sell you a used engine of unknown history and hope it matches. We rebuild the engine your Mercedes already has instead — strip it down, pressure-test it, and replace every worn or damaged component with updated OEM parts. You get a near-new engine with a 12-month unlimited-mileage warranty, without the compatibility risk of an unknown used unit. This is the option most M256 owners choose.
Replacement M256 Engines
If your existing engine is beyond economical repair, we also offer full engine replacement and fitting — sourced and fitted by our team, with the same 12-month unlimited-mileage warranty.
Used M256 Engines
In some cases, a matched low-mileage used engine is the right call — particularly if you need your car back on the road quickly and your existing engine's damage is extensive. We can source and fit these too, though most owners who ask about used engines end up choosing a rebuild once they understand the compatibility risk a used unit carries.
MERCEDES-BENZ M256
RECONDITIONED ENGINES
"Reconditioned" is the term many owners search for when they mean the same thing as a rebuild — 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.
MERCEDES-BENZ M256
REFURBISHED ENGINES
"Refurbished" often describes the same process from a different angle — restoring your existing engine to full working condition rather than replacing it outright. Our rebuild covers this.
MERCEDES-BENZ M256
REMANUFACTURED ENGINES
Some owners specifically search for a "remanufactured" engine, expecting a unit rebuilt to original specification with updated components. That's consistent with what our rebuild service delivers, regardless of which of the six M256-equipped models you drive.
FREQUENTLY ASKED QUESTIONS
GET YOUR FREEMERCEDES-BENZ M256FIXED-PRICE QUOTE
Most quotes returned within 30 minutes during working hours.