Mercedes R350 CDIEngine Rebuild— From £2,800
Specialist Mercedes R350 CDI 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 R350 CDI Engine
Vehicle
Mercedes R350 CDI
Model
R-Class
Variant
R350 CDI
Fuel
Diesel
Engine
OM642
Capacity
3.0L V6
Generation
W251/V251 (2006–2013)
Rebuild From
£2,800
Not sure which engine you have?
The R350 CDI 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 R350 CDIEngine Rebuild Price
Starting From £2,800
Engine Code
OM642Rebuild From
£2,800
Generation
W251/V251 (2006–2013)
Exact price depends on condition and parts required — submit your reg for a fixed-price quote.
Mercedes R350 CDI Swirl Flap & Injector Wear
If your R350 CDI has the OM642 diesel V6 — which applies to every R350 CDI built between 2006 and 2013 — 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.
The petrol R350 and R500 variants use different engine families (M272 and M113 respectively), which don't share this specific diesel V6 issue. If your car is the R63 AMG with the M156 V8, that has its own separate camshaft adjuster and head bolt wear pattern — a different AMG-specific concern.
Source: established specialist pattern, multiple TSBs, per VRF-mercedes-r-class.md. R350/R500 petrol not individually confirmed for known issues; R63 AMG M156 pattern confirmed separately per VRF
Mercedes R350 CDIENGINE OPTIONS
Every R350 CDI is different. That's why we offer the right solution for your engine, your car and your budget.
REBUILDING YOUR R350 CDI ENGINE
We rebuild the engine your R350 CDI 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 R350 CDI 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 R350 CDI ENGINES
Restoring your existing engine to full working condition rather than replacing it outright. Our rebuild service covers this.
Learn moreREMANUFACTURED R350 CDI ENGINES
Built to original specification with updated components. That's consistent with what our rebuild service delivers on the M256.
Learn moreREPLACEMENT R350 CDI 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 R350 CDI 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 R350 CDI, 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 R350 CDI rebuild looks like.
Mercedes R350 CDI ENGINE REBUILD PROCESS
WHAT MERCEDES R350 CDI OWNERS SAY
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm your R350 CDI has the M256, along with an exact rebuild price.
WHY MERCEDES R350 CDI OWNERS CHOOSE US
Engine matched using VIN or registration number — confirms your OM642 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 R350 CDI
RECOVERY
Mercedes R-Class 63
DIAGNOSTICS
Mercedes R-Class
STRIPPED ENGINE
Mercedes R-Class S
TIMING CHAIN REPLACEMENT
Mercedes R350 CDI
IN FOR REBUILD
Mercedes R-Class C
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most R-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 R350 CDI 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 R350 CDI ENGINE
The R350 CDI uses the OM642 — a 3.0-litre V6 diesel that served as Mercedes' workhorse six-cylinder diesel across much of the late 2000s and early 2010s. It was fitted throughout the R-Class's entire production run from 2006 to 2013, across both the W251 (standard wheelbase) and V251 (long wheelbase) chassis. The OM642 is a robust engine, but one with a well-documented pattern of swirl flap and injector wear over time — which is precisely what we address as standard on every rebuild.
We continue to rebuild and replace M256 engines for every R350 CDI on the road.
MERCEDES R350 CDI ENGINE CODES
M256 (R190, 2023–present)
A 3.0-litre inline-six petrol mild-hybrid engine fitted to the R350 CDI 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 R350 CDIMERCEDES R350 CDI ENGINE COMPATIBILITY
Because the R350 CDI uses the M256 — a different engine from the V8 units in the GT 63 range — fitting the wrong replacement or assuming parts from other R-Class variants will work 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 R-Class quote — it protects you from paying for parts that don't fit your actual car.
MERCEDES R350 CDI APPLICATIONS BY GENERATION
Generation
Chassis
Years
Engine Code
Fuel
MERCEDES R350 CDI ENGINES BY YEAR
From the R190's launch in 2023, the R350 CDI 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 R350 CDI 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 R350 CDI MODEL YEAR:
Mercedes R350 CDI
2006 Engine Rebuild
Mercedes R350 CDI
2007 Engine Rebuild
Mercedes R350 CDI
2008 Engine Rebuild
Mercedes R350 CDI
2009 Engine Rebuild
Mercedes R350 CDI
2010 Engine Rebuild
Mercedes R350 CDI
2011 Engine Rebuild
Mercedes R350 CDI
2012 Engine Rebuild
Mercedes R350 CDI
2013 Engine Rebuild
If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg.
MERCEDES R350 CDI ENGINE COSTS
A Mercedes R350 CDI 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 R350 CDI ENGINE SIZES
• Mercedes R350 CDI 3.0 Litre Engine (M256, I6)
MERCEDES R350 CDI FUEL TYPES
• Mercedes R350 CDI Petrol Mild Hybrid Engine Rebuilds
RELATED MERCEDES R-CLASS VARIANTS
Most Mercedes R-Class engine rebuilds are completed within 3-5 working days.
Nationwide recovery and collection available for all R-Class models.