Is the Mercedes CLK 230 / 280 / 320 engine reliable?

It depends on which engine your CLK has. The M112 V6 in the CLK 320 is regarded as a solid, reliable engine when properly maintained – it's the pick of the bunch. The M111 in the CLK 230 Kompressor is characterful but has timing chain and oil leak vulnerabilities. The M272 in the CLK 280 is a more modern engine but suffers from a well‑documented balance shaft gear failure on early engines (serial numbers below 468993).

What are the common problems with the Mercedes CLK 230 / 280 / 320?

On the CLK 230 (M111), the most common issues are timing chain stretch and camshaft adjuster wear, and oil leaks from the camshaft actuator into the wiring loom. On the CLK 320 (M112), the main issue is valve cover oil leaks. On the CLK 280 (M272), the defining weakness is balance shaft gear failure (early engines) and swirl flap issues.

Is it worth replacing a CLK engine, or should I scrap the car?

Depends on vehicle value and condition. Against a tidy £3,000–£8,000 CLK, a £1,800–£3,500 recon is 20‑60% of the car's value – often worth it on well‑maintained examples. If the M272 balance shaft has failed catastrophically, a full engine replacement may be necessary. Get a full diagnostic assessment before committing. The CLK is becoming a modern classic, so well‑preserved examples may justify the investment.

How do I find my CLK's engine code?

The CLK 230 Kompressor (1997‑2002) uses the M111.975 (193 PS) or M111.982 (197 PS). The CLK 320 (1998‑2010) uses the M112.940/.955. The CLK 280 (2005‑2010) uses the M272.940. The engine code is stamped on the engine block and listed on your V5C. For the M272, check the engine serial number – if it's above 468993, the balance shaft issue should be resolved.

Can I repair a CLK engine issue, or does it need replacement?

Most issues – M111 timing chain wear (if caught early), M112 valve cover gaskets, M272 balance shaft wear (if caught early) – are repairable. However, if the M272 balance shaft has failed or the timing chain has snapped, a full engine replacement is usually more cost‑effective than a rebuild.

Mercedes CLK 230/280/3201997–20103 Engine Families

Mercedes CLK 230 / 280 / 320 Engine Replacement — Compare Prices & Get Quotes

Name: Mercedes CLK 230/280/320 UK Engine Enquiry Data 2025
Creator: MercedesEngine.uk

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Mercedes CLK Engines — from £800 to £3,500Common codes: M111, M112, M272

Mercedes CLK Engines — from £800 to £3,500· Common codes: M111, M112, M272

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Mercedes CLK 230 / 280 / 320 — Which Engine Does Your Car Actually Have?

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

193‑197 PS — supercharged four, timing chain stretch and oil leaks are the main concerns

GenerationYearsEngine CodeReliabilityRecon CostEra Note

C208/A208 (CLK 230 Kompressor)

1997–2002M111.975 / .982 (2.3L I4 Supercharged)★★★½☆ [NEWLY ASSIGNED — see Data Note]£1,800–£2,800 [PLACEHOLDER — confirm vs cost sheet]193‑197 PS — supercharged four, timing chain stretch and oil leaks are the main concerns

C208/A208 (CLK 320)

1998–2002M112.940 (3.2L V6)★★★★☆ [NEWLY ASSIGNED — see Data Note]£2,000–£3,200 [PLACEHOLDER — confirm vs cost sheet]218 PS — SOHC V6, regarded as a solid, reliable engine when properly maintained

C209/A209 (CLK 320)

2002–2010M112.955 (3.2L V6)★★★★☆ [NEWLY ASSIGNED — see Data Note]£2,000–£3,200 [PLACEHOLDER — confirm vs cost sheet]218 PS — later M112, same robust V6, valve cover oil leaks are the main weakness

C209/A209 (CLK 280)

2005–2010M272.940 (3.0L V6)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£2,200–£3,500 [PLACEHOLDER — confirm vs cost sheet]231 PS — DOHC V6, balance shaft gear failure is the defining vulnerability

Why use this era map?

This table is the single source every other section on this page must match. Sections 2, 4, and 6 reference it rather than restating conflicting figures.

Mercedes CLK 230 / 280 / 320 Engine Replacement Costs

Supply Only£1,800–£3,200

Fitted (Indie)£2,800–£4,500

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£800–£1,800£1,400–£2,8001–6 monthsBudget priority; short‑term ownership

Reconditioned Engine£1,800–£3,200£2,800–£4,50012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£2,800–£3,500£3,800–£5,00012–24 monthsLong‑term ownership; maximum reliability

Main Dealer NewN/A (NLA)N/AN/ANot available — all engines are rebuilt or used

Figures above reflect the CLK pricing across generations. A reconditioned engine typically costs £1,200–£2,200, with total installed cost around £1,800–£2,800. On average, a full engine replacement can run anywhere between £1,500 and £5,000 depending on the car model and engine type. The M272 (CLK 280) is at the upper end of the range due to its complexity.

Labour estimate: Fitting a CLK engine typically takes 10‑14 hours at £75‑£110/hr (independent Mercedes specialist). The CLK's engine bay provides reasonable access, though the V6 engines are more tightly packaged than the four‑cylinder.

→ Compare CLK engine prices from UK specialists

Common Problems

1. M111 Timing Chain Stretch & Camshaft Adjuster Wear (CLK 230 Kompressor)

Symptoms: Rattling noises on start‑up, power loss, rough running, engine backfires, metallic ticking from the engine, reduced acceleration. A clicking noise is fairly common on many M111s and is often caused by a faulty camshaft adjuster.

Typical mileage: 100,000–130,000 miles (160,000‑200,000 km).

Repair cost: £800–£2,000 [PLACEHOLDER] (timing chain, guides, and tensioner replacement).

Replacement cost: £1,800–£2,800 [PLACEHOLDER] (if chain snaps or jumps and damages the engine).

🔴 Immediate - if you hear rattling on start‑up or ticking, book an inspection immediately.

Our recommendation:

The M111's timing chain can stretch over time, and the camshaft adjuster can wear out. A clicking noise is fairly common on many M111s and is often caused by a faulty camshaft adjuster. The chain typically requires replacement after 160,000‑200,000 km. Using the incorrect engine oil grade is a major cause of timing chain issues. At the first sign of rattling or ticking, have the timing system inspected immediately. A £800–£2,000 preventative chain replacement is far cheaper than a £1,800–£2,800 engine replacement.

1. M111 Timing Chain Stretch & Camshaft Adjuster Wear (CLK 230 Kompressor)

Typical mileage: 100,000–130,000 miles (160,000‑200,000 km).

Repair cost: £800–£2,000 [PLACEHOLDER] (timing chain, guides, and tensioner replacement).

Replacement cost: £1,800–£2,800 [PLACEHOLDER] (if chain snaps or jumps and damages the engine).

🔴 Immediate - if you hear rattling on start‑up or ticking, book an inspection immediately.

Our recommendation:

2. M111 Oil Leaks — Camshaft Actuator & Wiring Loom (CLK 230 Kompressor)

Symptoms: Oil spots under the vehicle, burning oil smell, low oil level warning, engine warning lights, O2 sensor or MAF issues. Oil can leak from the camshaft variable timing actuator into the wiring loom.

Typical mileage: 80,000–120,000 miles.

Repair cost: £200–£600 [PLACEHOLDER] (actuator seal replacement and wiring loom cleaning/replacement).

Replacement cost: N/A — repair only.

🟠 Check - book inspection urgently if oil leak is detected or warning lights appear.

Our recommendation:

The M111 engine has issues with oil leaks from the camshaft variable timing actuator into the wiring loom. This eventually requires the loom to be cleaned or replaced and can cause O2 sensor or MAF issues. If you notice oil spots or warning lights, have the actuator seals and wiring harness inspected. Early intervention can prevent more expensive sensor failures.

3. M112 Valve Cover Oil Leaks (CLK 320, 1998–2010)

Symptoms: Oil spots under the vehicle, burning oil smell, low oil level warning, visible oil leak from the top of the engine. Oil leaks on the breathers and valve covers are very common on the M112.

Typical mileage: 60,000–100,000 miles.

Repair cost: £200–£600 [PLACEHOLDER] (valve cover gasket replacement — both sides).

Replacement cost: N/A — repair only.

🟠 Check - book inspection urgently if oil leak is detected.

Our recommendation:

The M112 V6 is known for oil leaks from the valve cover gaskets. The breathers are sealed with RTV, but the valve covers use regular gaskets that can harden and leak over time. If you notice oil spots or a burning smell, have the valve cover gaskets inspected. Replacement is relatively straightforward and much cheaper than letting the leak worsen. The M112 is regarded as a solid engine when properly maintained.

4. M272 Balance Shaft Gear Failure (CLK 280, 2005–2010)

Symptoms: Engine warning light with codes P0016/P0017, rattling noises from the engine, loss of power, rough running, potential engine failure. The balance shaft gear is made of improperly hardened metal and can wear out.

Typical mileage: 60,000–120,000 miles.

Repair cost: £1,500–£3,500 [PLACEHOLDER] (balance shaft and timing gear replacement — engine out job).

Replacement cost: £2,200–£3,500 [PLACEHOLDER] (if failure causes catastrophic engine damage).

🔴 Immediate - if the engine warning light appears with P0016/P0017, book an inspection immediately.

Our recommendation:

The M272 V6 is the defining weakness of the CLK 280. Early M272 engines (up to mid‑2006) suffer from balance shaft gear failure due to improperly hardened timing gears. This requires the engine to be removed for repair. Engines with serial numbers after 468993 are generally safe. Check your engine serial number before buying. If you see P0016/P0017 codes, have the balance shaft inspected immediately — ignoring it can lead to catastrophic engine failure.

5. M272 Swirl Flap Issues (CLK 280, 2005–2010)

Symptoms: Engine warning light, loss of low‑end torque, rough idle, poor fuel economy.

Typical mileage: 80,000–120,000 miles.

Repair cost: £400–£1,200 [PLACEHOLDER] (swirl flap linkage repair or intake manifold replacement).

Replacement cost: N/A — repair only.

🟠 Check - book inspection soon if warning lights appear.

Our recommendation:

The M272 can suffer from swirl flap issues in the intake manifold. The swirl flaps can seize or the linkage can fail, causing engine warning lights and reduced performance. If you experience power loss or see warning lights, have the intake manifold inspected. Regular cleaning of the EGR system can help prevent this issue.

Weighing Your Options?

Compare Specialist Quotes When You're Ready

25+ vetted Mercedes specialists, covering the M111, M112 See CLK Engine Options

Mercedes CLK 230 / 280 / 320 — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Mercedes CLK 230 / 280 / 320 — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseM111 timing chain stretch (CLK 230)✅ Yes (if caught early)£800–£2,000 [PLACEHOLDER]Catch it early — cheaper than engine replacementM111 camshaft adjuster wear (CLK 230)✅ Yes£500–£1,200 [PLACEHOLDER]Worth fixing — common and well‑understood repairM111 oil leaks / wiring loom (CLK 230)✅ Yes£200–£600 [PLACEHOLDER]Essential maintenance — always worth doingM112 valve cover oil leaks (CLK 320)✅ Yes£200–£600 [PLACEHOLDER]Straightforward fix — always worth doingM272 balance shaft gear wear (CLK 280)✅ Yes (if caught early)£1,500–£3,500 [PLACEHOLDER]Catch it early — engine‑out job but cheaper than replacementM272 balance shaft failed❌ Usually No£2,200–£3,500+Full engine replacement often more cost‑effectiveM272 swirl flap issues (CLK 280)✅ Yes£400–£1,200 [PLACEHOLDER]Worth fixing — common and well‑understood repairMajor internal failure (any engine)❌ Usually No£1,800–£3,500+Full engine replacement often more cost‑effective

Buying This Mercedes CLK 230 / 280 / 320? Check These First

Buy If

Full Mercedes service history with regular oil changes (every 8,000‑10,000 miles)
CLK 230 (M111): Timing chain quiet — no rattling on cold start
CLK 320 (M112): Valve cover gaskets replaced and no oil leaks
CLK 280 (M272): Engine serial number above 468993 — balance shaft issue resolved
A well‑maintained example — the CLK is a modern classic in the making

Avoid If

CLK 230 (M111): Any sign of timing chain rattle on cold start or ticking
CLK 230 (M111): Any sign of oil leaks into the wiring loom
CLK 320 (M112): Any sign of oil leaks from the valve covers
CLK 280 (M272): Any sign of rattling or P0016/P0017 codes — balance shaft warning
CLK 280 (M272): Engine serial number below 468993 — high risk of balance shaft failure
Poor service history — these engines are intolerant of neglect

Closing Verdict

The Mercedes CLK 230, 280 and 320 represent some of the most desirable petrol engines in the CLK range. The M112 V6 in the CLK 320 is regarded as a solid, reliable engine when properly maintained — it's the pick of the bunch for reliability. The M111 in the CLK 230 Kompressor offers characterful supercharged performance but has timing chain and oil leak vulnerabilities. The M272 in the CLK 280 is a more modern DOHC V6 but suffers from a well‑documented balance shaft gear failure on early engines. Buy on service history and engine serial number above all else — a well‑maintained CLK with the right engine is a rewarding and increasingly collectable car; a neglected example can be expensive to repair.

Don't guess.Get the right engine at the right price.

→ Compare CLK engine prices before you buy

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Buying Checklist

Before you buy a used Mercedes CLK 230 / 280 / 320 (or before you commit to an engine replacement), check these:

1. Cold Start — Any rattling? (M111 timing chain or M272 balance shaft warning)

2. Service History — Regular oil changes (every 8,000‑10,000 miles) — this is non‑negotiable

3. Engine Serial Number — CLK 280 (M272): Check if above 468993 (balance shaft issue resolved)

4. Engine Warning Light — Have codes been read? Any P0016/P0017? (M272 balance shaft)

5. Oil Leaks — Check under the vehicle and around the valve covers (M112) and wiring loom (M111)

6. Running Quality — Any rough idle, hesitation, or ticking? (camshaft adjuster or swirl flap warning)

7. Oil Consumption — Does it use more than 1L per 1,000 miles?

8. MOT History — Check for emissions‑related failures or any advisory notes

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

This table's rows match Section 1B's Era Map exactly.

M111.975 / .982 (2.3L I4 Supercharged)

Years1997–2002

Power193‑197 PS (142‑145 kW) / 280 Nm

2025 Enquiries— (pattern data)

Avg. Recon Cost£1,800–£2,800 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M111.975 / .982 (2.3L I4 Supercharged)1997–2002193‑197 PS (142‑145 kW) / 280 Nm— (pattern data)£1,800–£2,800 [PLACEHOLDER]

M112.940 / .955 (3.2L V6)1998–2010218 PS (160 kW) / 310 Nm— (pattern data)£2,000–£3,200 [PLACEHOLDER]

M272.940 (3.0L V6)2005–2010231 PS (170 kW) / 300 Nm— (pattern data)£2,200–£3,500 [PLACEHOLDER]

Technical Specs

M272 — 3.0L V6

Displacement2,295 cc

Cylinders4‑cylinder inline; 15° inclination to the right

Bore x Stroke90.9 x 88.4 mm

Valves per Cylinder4

Fuel SystemMulti‑point fuel injection

AspirationSupercharged (Kompressor)

DriveRear‑wheel drive

Displacement3,199 cc

Cylinders6‑cylinder V6 (90°); light‑alloy block

Bore x Stroke89.9 x 84.0 mm

Valve TrainSOHC, 3 valves per cylinder

Fuel SystemMulti‑point fuel injection

DriveRear‑wheel drive

Displacement2,996 cc

Cylinders6‑cylinder V6 (90°); light‑alloy block

Bore x Stroke88.0 x 82.1 mm

Valve TrainDOHC, 4 valves per cylinder

Fuel SystemMulti‑point fuel injection

DriveRear‑wheel drive

→ Compare CLK engine prices for your Mercedes

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Market Intelligence

Most Common Failure

M111: Timing chain stretch — M112: Valve cover oil leaks — M272: Balance shaft gear failure

Average Enquiry Mileage

80,000

–120,000 miles

[PATTERN DATA]

Average Replacement Cost

£2,200

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

M112 — the CLK 320 V6 is the most popular

[PATTERN DATA]

Peak Enquiry Season

Spring/Summer — classic and convertible car interest peaks

[PATTERN DATA]

Regional Demand

South East22%

London16%

South West (12%) — premium coupe/cabriolet strongholds

PATTERN DATA

Regional Demand Breakdown

22%South East

16%London

Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12‑month unlimited‑mileage warranty — always confirm terms with your chosen supplier.

Why UK Mercedes CLK 230 / 280 / 320 Owners Trust MercedesEngine.uk

Trusted CLK Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real CLK owners, as part of the Engine Finders network, covering the M111, M112 and M272 engines across both generations of the CLK.
Compare CLK Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who understand the M111's timing chain vulnerabilities, the M112's oil leak patterns, and the M272's balance shaft issues.
UK Engine Replacement Services for the CLK
supply‑only or full supply & fit available nationwide, covering the C208/A208 and C209/A209 generations of the CLK 230, 280 and 320, with specialist knowledge of Mercedes' petrol engines.

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