Mercedes S350dEngine Rebuild— From £2,800
Specialist Mercedes S350d 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 S350d Engine
Vehicle
Mercedes S350d
Model
S-Class
Variant
S350d
Fuel
Diesel
Engine
OM642 (W221/W222) or OM656 (W223)
Capacity
3.0L V6/I6
Generation
W221 (2008–2013) · W222 (2013–2020) · W223 (2020–present)
Rebuild From
£2,800
Not sure which engine you have?
The S350D 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 S350dEngine Rebuild Price
Starting From £2,800
Engine Code
OM642Rebuild From
£2,800
Generation
W221 (2008–2013)
Engine Code
OM642Rebuild From
£2,800
Generation
W222 (2013–2020)
Engine Code
OM656Rebuild From
£2,800
Generation
W223 (2020–present)
Exact price depends on condition and parts required — submit your reg for a fixed-price quote.
Mercedes S350d Swirl Flap & Injector Wear (W221/W222, OM642)
If your S350d is a pre-2020 model with the OM642 diesel V6 — that's the W221 or W222 generation — 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 newer W223 generation uses a different engine, the OM656, which doesn't share this specific issue — it's a separate, more recent design with its own occasional injector seal wear at higher mileage, but nothing as consistently documented as the older engine's swirl flap pattern.
Source: established specialist pattern, multiple TSBs, per VRF-mercedes-s-class.md. OM656 explicitly excluded from this claim per VRF, correctly scoped to generation
Mercedes S350dENGINE OPTIONS
Every S350D is different. That's why we offer the right solution for your engine, your car and your budget.
REBUILDING YOUR S350D ENGINE
We rebuild the engine your S350D 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 S350D 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 S350D ENGINES
Restoring your existing engine to full working condition rather than replacing it outright. Our rebuild service covers this.
Learn moreREMANUFACTURED S350D ENGINES
Built to original specification with updated components. That's consistent with what our rebuild service delivers on the M256.
Learn moreREPLACEMENT S350D 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 S350D 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 S350D, 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 S350d rebuild looks like.
Mercedes S350d ENGINE REBUILD PROCESS
WHAT MERCEDES S350D OWNERS SAY
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm your S350D has the M256, along with an exact rebuild price.
WHY MERCEDES S350D OWNERS CHOOSE US
Engine matched using VIN or registration number — confirms OM642 vs OM656 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 S350d
RECOVERY
Mercedes S-Class 63
DIAGNOSTICS
Mercedes S-Class
STRIPPED ENGINE
Mercedes S-Class S
TIMING CHAIN REPLACEMENT
Mercedes S350d
IN FOR REBUILD
Mercedes S-Class C
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most S-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 S350D 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 S350D ENGINE
The S350d has been a mainstay of the S-Class diesel range since 2008, spanning three generations under one badge. Early and mid-generation cars (W221 and W222, roughly 2008 to 2020) use the OM642 — a 3.0-litre V6 diesel shared across a wide range of Mercedes models of that era. From 2020, the W223-generation S350d switched to the OM656, a newer inline-six diesel that's a different unit entirely, not an evolution of the OM642. 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.
We continue to rebuild and replace M256 engines for every S350D on the road.
MERCEDES S350D ENGINE CODES
OM642 (W221, W222)
A 3.0-litre V6 diesel fitted to the S350d from 2008 to 2020, across two generations. Known for swirl flap and injector wear over time — see the callout above. We replace both as standard on every OM642 rebuild, along with the timing chain where worn.
Check Your OM642 S350dOM656 (W223)
The current 3.0-litre inline-six diesel, fitted from 2020. A genuinely different design from the OM642, with its own occasional injector seal wear at higher mileage but no equivalent to the older engine's well-documented swirl flap pattern.
Check Your OM656 S350dMERCEDES S350D ENGINE COMPATIBILITY
Because the S350d spans two distinct engines across three generations, fitting the wrong replacement — or assuming an OM642 part will work on an OM656 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 S-Class quote — it protects you from paying for parts that don't fit your actual car.
MERCEDES S350D ENGINES BY YEAR
From the R190's launch in 2023, the S350D 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 S350D 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 S350D MODEL YEAR:
Mercedes S350d
2008 Engine Rebuild
Mercedes S350d
2009 Engine Rebuild
Mercedes S350d
2010 Engine Rebuild
Mercedes S350d
2011 Engine Rebuild
Mercedes S350d
2012 Engine Rebuild
Mercedes S350d
2013 Engine Rebuild
Mercedes S350d
2014 Engine Rebuild
Mercedes S350d
2015 Engine Rebuild
Mercedes S350d
2016 Engine Rebuild
Mercedes S350d
2017 Engine Rebuild
Mercedes S350d
2018 Engine Rebuild
Mercedes S350d
2019 Engine Rebuild
Mercedes S350d
2020 Engine Rebuild
Mercedes S350d
2021 Engine Rebuild
Mercedes S350d
2022 Engine Rebuild
Mercedes S350d
2023 Engine Rebuild
Mercedes S350d
2024 Engine Rebuild
Mercedes S350d
2025 Engine Rebuild
Mercedes S350d
2026 Engine Rebuild
If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg.
MERCEDES S350D ENGINE COSTS
A Mercedes S350d 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 S350D ENGINE SIZES
• Mercedes S350d 3.0 Litre Engine (M256, I6)
MERCEDES S350D FUEL TYPES
• Mercedes S350d Petrol Mild Hybrid Engine Rebuilds
RELATED MERCEDES S-CLASS VARIANTS
Most Mercedes S-Class engine rebuilds are completed within 3-5 working days.
Nationwide recovery and collection available for all S-Class models.