Mercedes CLS 350Engine Rebuild— From £3,200
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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 CLS 350 Engine
Vehicle
Mercedes CLS 350
Model
CLS
Variant
CLS 350
Fuel
Petrol (M272) or Diesel (OM642)
Engine
M272 or OM642
Capacity
3.0L–3.5L V6
Generation
C219 (2004–2010) · C218 (2010–2018)
Rebuild From
£3,200
Not sure which engine you have?
The CLS 350 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 CLS 350Engine Rebuild Price
Starting From £3,200
Engine Code
M256Rebuild From
£3,200
Generation
R190 (2023–present)
Exact price depends on condition and parts required — submit your reg for a fixed-price quote.
Mercedes CLS 350 Oil Leaks & Coolant System Wear (M256 I6)
The M256 is a sophisticated 3.0-litre inline-six with an integrated starter-generator and electric auxiliary compressor — 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.
Because the CLS 350 uses a completely different engine family from the V8 M178 fitted to the CLS 63 and GT 63 S, parts and rebuild specifications don't cross over between them.
Source: Established M256 specialist pattern — timing chain, bearing and gasket wear across integrated-starter-generator inline-six units.
Mercedes CLS 350ENGINE OPTIONS
Every CLS 350 is different. That's why we offer the right solution for your engine, your car and your budget.
REBUILDING YOUR CLS 350 ENGINE
We rebuild the engine your CLS 350 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 CLS 350 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 CLS 350 ENGINES
Restoring your existing engine to full working condition rather than replacing it outright. Our rebuild service covers this.
Learn moreREMANUFACTURED CLS 350 ENGINES
Built to original specification with updated components. That's consistent with what our rebuild service delivers on the M256.
Learn moreREPLACEMENT CLS 350 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 CLS 350 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 CLS 350, 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 CLS 350 rebuild looks like.
Mercedes CLS 350 ENGINE REBUILD PROCESS
WHAT MERCEDES CLS 350 OWNERS SAY
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm your CLS 350 has the M256, along with an exact rebuild price.
WHY MERCEDES CLS 350 OWNERS CHOOSE US
Engine matched using VIN or registration number — confirms M272 vs 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 CLS 350
RECOVERY
Mercedes CLS 63
DIAGNOSTICS
Mercedes CLS
STRIPPED ENGINE
Mercedes CLS S
TIMING CHAIN REPLACEMENT
Mercedes CLS 350
IN FOR REBUILD
Mercedes CLS C
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most CLS 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 CLS 350 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 CLS 350 ENGINE
The CLS 350 has been a key part of the CLS range since the model's inception in 2004. The first-generation C219 (2004–2010) uses the M272 — a 3.5-litre naturally aspirated petrol V6. From 2010, the C218-generation CLS 350 switched to the OM642, a 3.0-litre V6 diesel. This is a completely different engine, not an evolution of the M272. Knowing which one your car has matters, because the components, the known wear pattern, and even the rebuild specifics differ between them — which is exactly why we confirm your exact engine by registration before quoting. The CLS was discontinued entirely after the C257 in 2023, but we continue to rebuild and replace engines for every one still on the road.
We continue to rebuild and replace M256 engines for every CLS 350 on the road.
MERCEDES CLS 350 ENGINE CODES
M256 (R190, 2023–present)
A 3.0-litre inline-six petrol mild-hybrid engine fitted to the CLS 350 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 CLS 350MERCEDES CLS 350 ENGINE COMPATIBILITY
Because the CLS 350 spans two distinct engines across two generations, fitting the wrong replacement — or assuming an M272 part will work on an OM642 car — risks a compatibility problem that's expensive to unpick. Before we quote or supply anything, we confirm: - Your exact engine code (M272 or OM642) via registration or VIN - Your generation (C219 or C218) - Drivetrain and ancillary specification - Any electronics or ECU considerations specific to your exact build
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 CLS quote — it protects you from paying for parts that don't fit your actual car.
MERCEDES CLS 350 ENGINES BY YEAR
From the R190's launch in 2023, the CLS 350 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 CLS 350 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 CLS 350 MODEL YEAR:
Mercedes CLS 350
2004 Engine Rebuild
Mercedes CLS 350
2005 Engine Rebuild
Mercedes CLS 350
2006 Engine Rebuild
Mercedes CLS 350
2007 Engine Rebuild
Mercedes CLS 350
2008 Engine Rebuild
Mercedes CLS 350
2009 Engine Rebuild
Mercedes CLS 350
2010 Engine Rebuild
Mercedes CLS 350
2011 Engine Rebuild
Mercedes CLS 350
2012 Engine Rebuild
Mercedes CLS 350
2013 Engine Rebuild
Mercedes CLS 350
2014 Engine Rebuild
Mercedes CLS 350
2015 Engine Rebuild
Mercedes CLS 350
2016 Engine Rebuild
Mercedes CLS 350
2017 Engine Rebuild
Mercedes CLS 350
2018 Engine Rebuild
If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg.
MERCEDES CLS 350 ENGINE COSTS
A Mercedes CLS 350 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.
12 MONTH
UNLIMITED-MILEAGE
WARRANTY
MERCEDES CLS 350 ENGINE SIZES
• Mercedes CLS 350 3.0 Litre Engine (M256, I6)
MERCEDES CLS 350 FUEL TYPES
• Mercedes CLS 350 Petrol Mild Hybrid Engine Rebuilds
RELATED MERCEDES CLS VARIANTS
Most Mercedes CLS engine rebuilds are completed within 3-5 working days.
Nationwide recovery and collection available for all CLS models.