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Mercedes Benz CLC Class Engine ReplacementCompare Prices & Save
Get quotes today from trusted UK Mercedes Benz CLC Class engine specialists. Compare prices on reconditioned, rebuilt and used engines - supply & fit available.
CLC Class Diesel Engines - from £1,200 to £3,800
-> Rebuilt units from £1,500 · Common codes: OM646, OM642, OM646.980, OM642.852
CLC Class Petrol Engines - from £1,100 to £3,500
-> Rebuilt units from £1,400 · Common codes: M271, M272, M271.950, M272.960
CLC Class V6 Performance Engines - from £2,200 to £4,500
-> Rebuilt units from £2,200 · Common codes: M272E35, M272E25, M272.960, M272.940
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3 Simple Stepsto Finding the Best Mercedes Benz CLC Class Replacement Engine
Get Instant Quotes from Mercedes - Benz Engine Specialists Across the UK - 100% free, no obligation. Most replacements completed within 3-5 days.
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12-Month Warranty
Supply & Fit Available
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Live UK Engine Market Data
What Are UK Drivers Paying for Mercedes Benz CLC Class Engine Replacement?
The table below shows typical UK rebuilt engine replacement costs across different Mercedes Benz CLC Class variants, covering known failure causes, engine codes, and fuel types.
Average Market Prices
- Mercedes Benz CLC Class (CL203) CLC 200 Kompressor2008-2011£1,300-£2,800Timing chain wearM271.950Petrol 1.8L
- Mercedes Benz CLC Class (CL203) CLC 200 CGI2008-2011£1,400-£3,000Carbon build-upM271.860Petrol 1.8L
- Mercedes Benz CLC Class (CL203) CLC 2302008-2011£1,800-£3,500Balance shaft wearM272.921Petrol 2.5L
- Mercedes Benz CLC Class (CL203) CLC 3502008-2011£2,200-£4,200Balance shaft failureM272.960Petrol 3.5L
- Mercedes Benz CLC Class (CL203) CLC 200 CDI2008-2011£1,400-£3,000Swirl flap collapseOM646.981Diesel 2.1L
- Mercedes Benz CLC Class (CL203) CLC 220 CDI2008-2011£1,500-£3,200Swirl flap failureOM646.980Diesel 2.1L
- Mercedes Benz CLC Class (CL203) CLC 320 CDI2008-2011£1,800-£3,800Oil cooler seal leakOM642.852Diesel 3.0L
- Mercedes Benz CLC Class (CL203) CLC 1602008-2011£1,200-£2,400Timing chain stretchM271.910Petrol 1.8L
- Mercedes Benz CLC Class (CL203) CLC 180 Kompressor2008-2011£1,200-£2,500Timing chain tensioner failM271.946Petrol 1.8L
Last updated: 22 May, 14:59
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Models We Cover
Mercedes Benz CLC Class Engine ReplacementAll Variants Covered
From the economical CLC 200 CDI to the high-performance CLC 350 Sport, our network of trusted UK Mercedes Benz CLC Class engine specialists helps you compare rebuilt, reconditioned and used engine prices. Typical price range for a rebuilt unit with 12-month warranty is £1,200-£4,200 - supply & fit available nationwide.
Core Diesel Range
Specs122hp
Years2008-2011
Rebuilt£1,400-£3,000
Core Petrol Range
Performance & V6 Range
Variant Directory
All Mercedes Benz CLC Class Variants - Engine Replacement Coverage
A full alphabetical listing of every Mercedes Benz CLC Class trim covered by our network. All entries link to a dedicated variant page, where prices are further broken down by engine code, model year, and condition type. Click a live link to compare quotes.
Diesel Variants
CLC 200 CDICLC 200 CDI BlueEFFICIENCYCLC 200 CDI SportCLC 220 CDICLC 220 CDI BlueEFFICIENCYCLC 220 CDI SportCLC 320 CDICLC 320 CDI Sport
Petrol Variants
CLC 160CLC 160 BlueEFFICIENCYCLC 160 SportCLC 180 KompressorCLC 180 Kompressor SportCLC 200 CGICLC 200 CGI SportCLC 200 KompressorCLC 200 Kompressor SportCLC 230CLC 230 SportCLC 350CLC 350 Sport
Performance Variants
(None available for this model. All Sport trims are listed above under diesel or petrol categories.)
Engine Codes
Mercedes Benz CLC Class Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Mercedes Benz CLC Class across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Diesel Engines
Extracted from detailed diesel engine families across Mercedes Benz CLC Class variants.
Petrol Engines
Extracted from detailed petrol and performance engine families across Mercedes Benz CLC Class variants.
Can't find your engine code?
Can’t find your engine code? Enter your registration number above - we’ll instantly identify the exact unit, its technical specifications, and live replacement prices from UK Mercedes Benz CLC Class engine specialists. Every rebuilt engine comes with a minimum 12‑month unlimited mileage warranty.
Common Problems
Mercedes Benz CLC Class Engine Problems
What It Costs to Fix & When Replacement Makes Sense
Every rebuilt engine includes a minimum 12-month unlimited mileage warranty.
1. Mercedes Benz CLC Class M271 Timing Chain Failure
Why Petrol Engines Rattle on Startup
Affected Models
Mercedes Benz CLC Class CLC 160, CLC 180 Kompressor, CLC 200 Kompressor, CLC 200 CGI (2008-2011, M271.910, M271.946, M271.950, M271.860)
Typical Failure Mileage
45,000 - 80,000 miles
Root Cause
The M271 uses a single-row timing chain that stretches over time, combined with a plastic tensioner guide that loses hydraulic pressure. Cold starts produce a distinctive rattle as the chain slaps against the timing cover. If ignored, the chain can jump teeth, causing valve-to-piston contact and complete engine destruction.
Repair Options & Estimated Costs (UK ranges)
| Repair Tier | Dealer Price | Specialist Price | What It Involves | Longevity / Suitability |
|---|---|---|---|---|
Minor - Preventative Timing Chain Replacement Minor | £1,200 - £1,800 | £800 - £1,200 | Replacement of timing chain, tensioner, guides, and camshaft sprockets. Labour-intensive (8-10 hours) | 60,000+ miles. Only viable before chain jumps. Essential preventative maintenance |
Full Replacement - Rebuilt / Reconditioned Engine Best Value | £3,500 - £5,500 | £1,800 - £3,200 | Supply & fit of rebuilt M271 with upgraded timing components, new oil pump, and bench testing | 60,000+ miles. The right choice if chain has jumped or engine has suffered valve damage |
Our Recommendation
Best next step for mercedes benz clc class m271 timing chain failure
On a CLC Class worth £1,500-£4,000, preventative timing chain replacement is almost always the better value if caught early. Listen for cold-start rattle - the moment you hear it, book a specialist inspection. If the chain has already jumped, replacement is your only safe option. A specialist using upgraded timing components will outlast the original design.
Don't Let Engine Failure Write Off Your Mercedes Benz CLC Class
Your CLC Class is a niche model - finding the right specialist with experience on the CL203 platform matters. EngineMarket connects you with vetted UK Mercedes specialists who understand M271 timing chains, OM646 swirl flaps, M272 balance shafts, and OM642 oil cooler seals. Every rebuilt engine supplied through our network includes upgraded components designed to eliminate the original failure point, plus a 12-month unlimited mileage warranty. Compare prices, choose a specialist, and get back on the road without the main dealer premium.
Compare Mercedes Benz CLC Class Engine Replacement Prices Now →Mercedes Benz CLC Class Engine Problems
What It Costs to Fix & When Replacement Makes Sense
Affected Models
Mercedes Benz CLC Class CLC 160, CLC 180 Kompressor, CLC 200 Kompressor, CLC 200 CGI (2008-2011, M271.910, M271.946, M271.950, M271.860)
Typical Failure Mileage
45,000 - 80,000 miles
Root Cause
The M271 uses a single-row timing chain that stretches over time, combined with a plastic tensioner guide that loses hydraulic pressure. Cold starts produce a distinctive rattle as the chain slaps against the timing cover. If ignored, the chain can jump teeth, causing valve-to-piston contact and complete engine destruction.
Minor - Preventative Timing Chain Replacement
Dealer
£1,200 - £1,800
Specialist
£800 - £1,200
Replacement of timing chain, tensioner, guides, and camshaft sprockets. Labour-intensive (8-10 hours)
60,000+ miles. Only viable before chain jumps. Essential preventative maintenance
Full Replacement - Rebuilt / Reconditioned Engine
Dealer
£3,500 - £5,500
Specialist
£1,800 - £3,200
Supply & fit of rebuilt M271 with upgraded timing components, new oil pump, and bench testing
60,000+ miles. The right choice if chain has jumped or engine has suffered valve damage
Our Recommendation
Best next step for mercedes benz clc class m271 timing chain failure
On a CLC Class worth £1,500-£4,000, preventative timing chain replacement is almost always the better value if caught early. Listen for cold-start rattle - the moment you hear it, book a specialist inspection. If the chain has already jumped, replacement is your only safe option. A specialist using upgraded timing components will outlast the original design.
Don't Let Engine Failure Write Off Your Mercedes Benz CLC Class
Your CLC Class is a niche model - finding the right specialist with experience on the CL203 platform matters. EngineMarket connects you with vetted UK Mercedes specialists who understand M271 timing chains, OM646 swirl flaps, M272 balance shafts, and OM642 oil cooler seals. Every rebuilt engine supplied through our network includes upgraded components designed to eliminate the original failure point, plus a 12-month unlimited mileage warranty. Compare prices, choose a specialist, and get back on the road without the main dealer premium.
Compare Mercedes Benz CLC Class Engine Replacement Prices Now →Disclaimer: All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EngineMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Mercedes Benz CLC Class and engine code. Every engine supplied through EngineMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
12-Month Warranty
Upgraded Components
Nationwide UK Delivery
Save vs Main Dealer Price
Replacement Engine Options
Mercedes Benz CLC Class Engine TypesOptions, Costs & What to Expect
Every engine type for the Mercedes Benz CLC Class is available through our UK network with typical price ranges based on your exact variant, engine code and budget.
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Mercedes Benz CLC Class within hours.
Engine Sizes
Mercedes Benz CLC Class Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the Mercedes Benz CLC Class is listed below, with compatible engine codes, production years, power outputs and common failure notes.
Mercedes Benz CLC Class Diesel Engine Sizes
The 2.1-litre OM646 turbodiesel was the sole diesel displacement offered across the entire CLC Class range from 2008 to 2011. It powered the high-volume CLC 200 CDI and CLC 220 CDI variants, with two power outputs sharing the same basic block and common-rail injection architecture. This engine represented Mercedes' push for efficiency in the compact executive segment, delivering strong torque and respectable economy.
| Engine Code(s) | OM646.980, OM646.981 |
| Compatible Models (UK) | CLC 200 CDI (2008-2011), CLC 200 CDI Sport (2008-2011), CLC 200 CDI BlueEFFICIENCY (2009-2011), CLC 220 CDI (2008-2011), CLC 220 CDI Sport (2008-2011), CLC 220 CDI BlueEFFICIENCY |
| Production Years | 2009-2011 |
Common Failure Points
Watch for these known weak points
Swirl flap collapse into cylinders, injector seal leakage causing combustion knock, EGR valve clogging
Not sure which engine size your Mercedes Benz CLC Class needs? Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty from UK Mercedes Benz CLC Class specialists.
Mercedes Benz CLC Class Engines Fuel Type
Mercedes Benz CLC Class Engines by Fuel Type
Choose your Mercedes Benz CLC Class engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the economical CLC 200 CDI to the performance-oriented CLC 350 Sport.
Mercedes Benz CLC Class Diesel Engines
Mercedes Benz CLC Class Diesel Engines
The CLC Class diesel range relied exclusively on Mercedes' OM646 four-cylinder and OM642 V6 units, with the 2.1-litre four-cylinder dominating UK replacement enquiries due to swirl flap failures.
Common Engine Families
OM646.980/981 - 2.1L four-cylinder (CLC 200 CDI, CLC 220 CDI), swirl flap collapse is the #1 failure driver
OM642.852 - 3.0L V6 (CLC 320 CDI), oil cooler seal leaks and turbo actuator failures dominate replacement demand
Found In
CL203 CLC Class (2008-2011) - OM646.980 (150hp), OM646.981 (122hp), OM642.852 (224hp)
Known For
Excellent motorway economy (50+ mpg on OM646 cars)
Swirl flap ingestion causing catastrophic engine damage on four-cylinder units
Oil cooler seal failure on V6 causing persistent external leaks
High replacement demand on CLC 220 CDI - the most searched diesel variant
Typical Models (UK)
CLC 200 CDI
CLC 200 CDI Sport
CLC 220 CDI
CLC 220 CDI Sport
CLC 320 CDI
Not sure which fuel type your Mercedes Benz CLC Class has? Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Mercedes Benz CLC Class specialists.
Engine Years
Mercedes Benz CLC Class Engines by YearWhat Was Fitted & When
The Mercedes Benz CLC Class was produced as a single generation (CL203) from 2008 to 2011, evolving through running changes rather than generational breaks - this timeline covers every engine fitted across that period.
2008 - 2011 - CL203 CLC Class (Full Production)
Major Engine Change
The CLC debuted in August 2008 as a heavily updated version of the C-Class Sports Coupe (CL203), featuring over 1,100 new components and a revised engine lineup based entirely around Mercedes' four-cylinder M271 and V6 M272 units .
Key Changes
CL203 platform (previously C-Class Sports Coupe, 2001-2008) fully refreshed for CLC branding
M271 four-cylinder petrol engines offered with both supercharged (Kompressor) and direct-injection (CGI) configurations
OM646 four-cylinder diesel introduced as the efficiency-focused option
M272 V6 petrol and OM642 V6 diesel reserved for flagship variants
No AMG variants produced for CLC generation
Production ended June 2011 with final sales continuing through 2011
Known For
Single-generation model bridging the C-Class Sports Coupe and CLC branding
M271 timing chain tensioner failures drive most petrol replacement enquiries
OM646 swirl flap collapse is the #1 diesel failure, often requiring full replacement
M272 balance shaft wear affects V6 engines with serial numbers below 2729..30 468993
Lower entry price than equivalent C-Class made it a popular used buy
Main Engines
M271.910 - 1.6L petrol (CLC 160 BlueEFFICIENCY)
M271.946 - 1.8L supercharged petrol (CLC 180 Kompressor)
M271.950 - 1.8L supercharged petrol (CLC 200 Kompressor)
M271.860 - 1.8L direct-injection petrol (CLC 200 CGI)
M272.921 - 2.5L V6 petrol (CLC 230)
M272.960 - 3.5L V6 petrol (CLC 350)
OM646.981 - 2.1L diesel 122hp (CLC 200 CDI)
OM646.980 - 2.1L diesel 150hp (CLC 220 CDI)
OM642.852 - 3.0L V6 diesel (CLC 320 CDI)
Popular Models
Mercedes Benz CLC 200 CDI
Mercedes Benz CLC 220 CDI
Mercedes Benz CLC 200 Kompressor
Mercedes Benz CLC 180 Kompressor
Mercedes Benz CLC 350 Sport
Engine Codes Covered
M271.910M271.946M271.950M271.860M272.921M272.960OM646.981OM646.980OM646.963OM642.852
Common Replacement Enquiries
M271 timing chain replacement CLC 200 Kompressor
OM646 swirl flap failure CLC 220 CDI
M272 balance shaft repair CLC 350
OM642 oil cooler seal leak CLC 320 CDI
Get quotes for 2008-2011 Mercedes Benz CLC Class replacement engines
2008 - 2011 - CL203 CLC Class (Full Production)
Major Engine Change
The CLC debuted in August 2008 as a heavily updated version of the C-Class Sports Coupe (CL203), featuring over 1,100 new components and a revised engine lineup based entirely around Mercedes' four-cylinder M271 and V6 M272 units .
Key Changes
CL203 platform (previously C-Class Sports Coupe, 2001-2008) fully refreshed for CLC branding
M271 four-cylinder petrol engines offered with both supercharged (Kompressor) and direct-injection (CGI) configurations
OM646 four-cylinder diesel introduced as the efficiency-focused option
M272 V6 petrol and OM642 V6 diesel reserved for flagship variants
No AMG variants produced for CLC generation
Production ended June 2011 with final sales continuing through 2011
Known For
Single-generation model bridging the C-Class Sports Coupe and CLC branding
M271 timing chain tensioner failures drive most petrol replacement enquiries
OM646 swirl flap collapse is the #1 diesel failure, often requiring full replacement
M272 balance shaft wear affects V6 engines with serial numbers below 2729..30 468993
Lower entry price than equivalent C-Class made it a popular used buy
Main Engines
M271.910 - 1.6L petrol (CLC 160 BlueEFFICIENCY)
M271.946 - 1.8L supercharged petrol (CLC 180 Kompressor)
M271.950 - 1.8L supercharged petrol (CLC 200 Kompressor)
M271.860 - 1.8L direct-injection petrol (CLC 200 CGI)
M272.921 - 2.5L V6 petrol (CLC 230)
M272.960 - 3.5L V6 petrol (CLC 350)
OM646.981 - 2.1L diesel 122hp (CLC 200 CDI)
OM646.980 - 2.1L diesel 150hp (CLC 220 CDI)
OM642.852 - 3.0L V6 diesel (CLC 320 CDI)
Engine Codes Covered
M271.910M271.946M271.950M271.860M272.921M272.960OM646.981OM646.980OM646.963OM642.852
Popular Models
Mercedes Benz CLC 200 CDI
Mercedes Benz CLC 220 CDI
Mercedes Benz CLC 200 Kompressor
Mercedes Benz CLC 180 Kompressor
Mercedes Benz CLC 350 Sport
Common Replacement Enquiries
M271 timing chain replacement CLC 200 Kompressor
OM646 swirl flap failure CLC 220 CDI
M272 balance shaft repair CLC 350
OM642 oil cooler seal leak CLC 320 CDI
Get quotes for 2008-2011 Mercedes Benz CLC Class replacement engines
Year Finder
Not sure which year your Mercedes Benz CLC Class was built?
Not sure which year your Mercedes Benz CLC Class was built? Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK Mercedes Benz CLC Class specialists.
FAQ
Mercedes Benz CLC Class Engine ReplacementFrequently Asked Questions
Question 1
What are the most common engine problems on the Mercedes CLC Class?
The most frequent CLC engine failures are M271 timing chain stretch (petrol) and OM646 swirl flap collapse (diesel). Both can destroy the engine if ignored. M272 V6 balance shaft wear also affects 2008 CLC 230/350 models.
Key points
- • M271 petrol engines fail when the single-row timing chain stretches (45k-80k miles)
- • OM646 diesel swirl flaps break and fall into cylinders - immediate engine damage risk
- • M272 V6 balance shaft gear wears on engines with serial numbers below 2729..30 468993
- • Early warning signs: rattling on cold start (petrol) or hissing intake noise (diesel)
- • Preventative timing chain replacement costs less than half of a full engine rebuild
Question 2
How much does a Mercedes CLC Class engine replacement cost in the UK?
Rebuilt CLC engine prices range from £1,200 for a 1.8L M271 petrol to £4,200 for a 3.5L M272 V6. OM646 diesel units typically cost £1,400-£3,200. Supply and fit adds £500-£900 depending on the variant.
Key points
- • M271 1.8L petrol engines (CLC 160/180/200 Kompressor): £1,200-£2,800
- • OM646 2.1L diesel engines (CLC 200/220 CDI): £1,400-£3,200
- • M272 V6 engines (CLC 230/350): £1,800-£4,200
- • OM642 V6 diesel (CLC 320 CDI): £1,800-£3,800
- • All rebuilt engines on EngineMarket include 12-month unlimited mileage warranty
Question 3
Which CLC Class engine is the most reliable - petrol or diesel?
The OM646 2.1L diesel is generally more robust than the M271 petrol, but only if you address swirl flap failure preventatively. The M272 V6 petrol is reliable once the balance shaft issue is fixed. The M271 petrol's timing chain is its weak point.
Key points
- • OM646 diesel: swirl flap collapse is the main risk - delete flaps preventatively to eliminate it
- • OM646 engines reach 200k-400k miles with regular oil changes (MB229.5 spec)
- • M271 petrol: budget for timing chain replacement at 60k-80k miles as preventative maintenance
- • M272 V6 petrol: check engine serial number - balance shaft was upgraded mid-2008
- • None have catastrophic DPF or AdBlue issues - diesel is safe for mixed driving
Question 4
Is a CLC 180 Kompressor or CLC 200 Kompressor worth repairing when the timing chain fails?
Yes - a specialist timing chain replacement costs £800-£1,200 and returns the M271 engine to reliable service. Only replace the whole engine if the chain has jumped and damaged valves. A CLC worth £2,000-£4,000 justifies the repair.
Key points
- • Preventative timing chain replacement (before failure): £800-£1,200 at a specialist
- • Full engine replacement after valve damage: £1,800-£3,200 supply only
- • Upgraded timing components in rebuilt engines outlast the original design
- • Cars with full service history (MB229.5 oil) are better candidates for repair
- • Get a specialist inspection - if compression is good, timing chain repair is the smart choice
Question 5
What causes OM646 swirl flap failure on the CLC 220 CDI - and can it be fixed permanently?
Plastic swirl flaps in the intake manifold break from carbon buildup and heat cycles. They can drop into cylinders, destroying pistons and valves. The permanent fix is swirl flap removal and ECU mapping - not replacement with another plastic manifold.
Key points
- • Swirl flaps fail between 70k-120k miles as plastic pivot points wear
- • Dealer solution (£1,200+ new manifold) uses the same flawed plastic parts
- • Specialist flap removal and blanking (£400-£800) eliminates the failure permanently
- • Pre-2010 CLC models can have flaps removed legally - no MOT emissions issues
- • If flap ingestion already happened, you need a rebuilt OM646 engine (£1,500-£3,200)
Question 6
Does the CLC 320 CDI (OM642 V6 diesel) have engine problems I should know about?
The OM642 V6's most common failure is oil cooler seal leaks - orange rubber seals harden and leak externally or into the coolant. Replace with upgraded purple Viton seals. Timing chains and injectors are more robust than on four-cylinder Mercedes diesels.
Key points
- • Oil cooler seal failure occurs at 70k-110k miles - watch for oil drips or oily coolant
- • Specialist replacement with upgraded seals: £700-£1,200
- • Turbo actuator failure also common on higher-mileage OM642 units
- • The V6 diesel is otherwise reliable and smoother than OM646 four-cylinder
- • If ignored, oil leaks cause low pressure and turbo damage - then replacement is needed
Question 7
What engine codes were fitted to the Mercedes CLC Class - and which should I avoid?
CLC engines: M271 (1.8L petrol) in CLC 160/180/200 Kompressor and 200 CGI, M272 V6 in CLC 230/350, OM646 (2.1L diesel) in CLC 200/220 CDI, OM642 V6 diesel in CLC 320 CDI. None are "avoid at all costs" - each has a known weakness with a proven fix.
Key points
- • M271 (petrol) - weakness: timing chain stretch (fix: upgraded tensioner and chain)
- • OM646 (diesel) - weakness: swirl flap collapse (fix: flap delete and blanking)
- • M272 (V6 petrol) - weakness: balance shaft wear (fix: upgraded gear, check engine serial)
- • OM642 (V6 diesel) - weakness: oil cooler seals (fix: upgraded purple Viton seals)
- • All CLC engines share the same CL203 platform - no generation-specific surprises
Question 8
How long do Mercedes CLC Class engines last - and what maintenance extends their life?
A well-maintained OM646 diesel can reach 200k-400k miles. M271 petrol typically lasts 120k-180k miles but needs timing chain replacement around 60k-80k miles. The single most important factor is using Mercedes MB229.5 specification oil changed every 9,000 miles or 12 months.
Key points
- • OM646 diesel longevity: 200k-400k miles with regular oil changes using MB229.5
- • M271 petrol longevity: 120k-180k miles - timing chain is the limiting component
- • Service every 12 months/9,000 miles alternating between Service A and Service B
- • Coolant replacement every 15 years if original factory-filled long-life coolant
- • On M271 engines, check camshaft position sensor plugs for oil - oil in wiring damages ECU
Question 9
Can I fit a used CLC engine myself - or should I use a specialist?
A used engine may save money upfront but carries the same design flaws that killed your original unit. Specialists fitting rebuilt engines include upgraded components (timing chain, swirl flap delete) that prevent repeat failure. DIY fitment also risks immobiliser/ECU coding issues on CL203 platform cars.
Key points
- • Used engines: £800-£2,200 but no upgraded components - original failure risks remain
- • Rebuilt engines: £1,200-£4,200 with upgraded parts addressing the original failure point
- • CL203 platform requires ECU coding - a used ECU may need immobiliser synchronisation
- • Specialist supply & fit: £500-£900 added cost but includes warranty on parts AND labour
- • M271 timing chain replacement requires special timing tools - not a driveway job
Question 10
Is a rebuilt or reconditioned CLC engine better than a used one?
A rebuilt or reconditioned engine is almost always better value for long-term ownership. Used engines are cheaper upfront (£800-£2,200) but carry the same M271 timing chain or OM646 swirl flap risks. Rebuilt units (£1,200-£4,200) include upgraded components and a 12-month warranty.
Key points
- • Reconditioned: full strip-down, new pistons/rings/bearings - closest to new specification
- • Rebuilt: focused replacement of failed components + upgraded parts at the failure point
- • Used: lowest upfront cost but no warranty on internal condition or hidden damage
- • Only rebuilt engines include upgraded M271 timing components or OM646 swirl flap delete
- • For a car you plan to keep 2+ years, the extra £600-£1,200 for rebuilt pays for itself
Why Choose Us
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Join thousands of UK drivers who compare Mercedes Benz CLC Class engine prices through our network of trusted specialists - every rebuilt and reconditioned unit backed by a minimum 12-month unlimited mileage warranty and nationwide delivery.
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