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Mercedes M272 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 2.5-litre to 3.5-litre V6 petrol engine fitted to core Mercedes-Benz models from 2004 to 2011, including the C-Class, E-Class, and CLK. Reconditioned Mercedes M272 units are typically available from £3,800 , reflecting consistent specialist demand for this widely used platform.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£2,000
Reconditioned from
£3,800
Rebuilt from
£5,500
GB
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Quotes only from vetted UK engine specialists.
Key Specs
Mercedes M272 - Specifications at a Glance
Engine Code
M272 (M272.920, M272.940, M272.950, M272.960)
Fuel
Petrol
Configuration
2.5L-3.5L V6 naturally aspirated
Power Output(s)
150kW (204hp) - 225kW (306hp) depending on displacement and tune
Years Produced
2004-2011
UK Models Fitted
6+ Mercedes models - full list in Compatibility below
Replaced
M112
Replaced By
M276
Most Common Failure
Balance shaft sprocket wear and timing chain stretch
Reconditioned Price Range
£3,800-£6,500 supply-only
Vetted UK specialists for M272 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Mercedes Models Use the M272-
TAG: Fitted To
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Mercedes-Benz C-Class | W203 | C230, C280, C350 | 2005-2007 | |
| Mercedes-Benz C-Class | W204 | C230, C280, C300, C350 | 2007-2011 | |
| Mercedes-Benz E-Class | W211 | E230, E280, E350 | 2005-2009 | |
| Mercedes-Benz E-Class | W212 | E350 | 2009-2011 | |
| Mercedes-Benz CLK | C209 | CLK280, CLK350 | 2005-2009 | |
| Mercedes-Benz CLS | C219 | CLS280, CLS350 | 2005-2010 | |
| Mercedes-Benz S-Class | W221 | S350 | 2006-2011 | |
| Mercedes-Benz ML / GL | W164 | ML350, GL350 | 2005-2011 |
02
Mercedes-Benz C-Class
03
Mercedes-Benz E-Class
04
Mercedes-Benz E-Class
05
Mercedes-Benz CLK
06
Mercedes-Benz CLS
07
Mercedes-Benz S-Class
08
Mercedes-Benz ML / GL
CROSS-BRAND
M272 is documented across 8 BMW applications spanning C-Class, E-Class, CLK, CLS, S-Class, ML / GL. Registration lookup confirms the exact suffix before quotes are sent.
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Prices
Mercedes M272 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £2,000-£3,800 | £2,780-£4,840 | 3-6 months |
Reconditioned | £3,800-£6,500 | £4,580-£7,540 | 12-24 months |
Rebuilt | £5,500-£8,500 | £6,280-£9,540 | 12-24 months |
The final cost of a Mercedes M272 engine replacement is heavily influenced by the condition of the balance shaft assembly. If the balance shaft sprocket has failed and caused secondary internal damage, a standard repair is often more labour-intensive than a full swap, pushing the requirement toward a reconditioned or rebuilt unit. See our full reconditioned engine cost guide for a detailed breakdown of what is included at each price tier.
Labour Guide
Fitting a Mercedes M272 typically takes 12-16 hours at £65/hr (independent specialist rate) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Mercedes M272 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the M272, based on real-world data and verified failure patterns.
Verified issue focus: Balance shaft sprocket wear and timing chain stretch.
1. Balance Shaft Sprocket Wear and Timing Chain Stretch
1. Balance Shaft Sprocket Wear and Timing Chain Stretch
Typical onset:
60,000-100,000 miles
What happens:
Early production M272 engines (particularly those with engine numbers ending in 80-89, though the risk extends across the family) are notorious for premature balance shaft sprocket wear due to soft metallurgy. This causes the timing chain to stretch and jump teeth, triggering check engine lights for camshaft correlation faults and a distinct metallic rattling noise. If ignored, it leads to catastrophic valve-to-piston contact.
Repair vs replace:
If caught early, replacing the balance shaft sprockets, timing chain, and guides is viable, but it is a highly labour-intensive job requiring significant front-end strip-down or engine removal. If internal damage has already occurred, a full Mercedes M272 engine replacement is the only reliable solution.
Read more about this issue
2. Map-Controlled Thermostat and Cooling System Leaks
2. Map-Controlled Thermostat and Cooling System Leaks
Typical onset:
70,000-120,000 miles
What happens:
The electronically controlled thermostat housing on the M272 is prone to cracking and coolant leaks. This can lead to gradual coolant loss and overheating, which exacerbates timing chain tensioner wear and risks warping the cylinder heads or blowing the head gasket.
Repair vs replace:
Thermostat and housing replacement is a standard, relatively inexpensive preventative repair. However, if severe overheating has caused head gasket failure or warped components, a reconditioned engine swap becomes the most economical long-term fix.
Read more about this issue
Compare rebuilt M272 prices with the failure already addressed
Engine Variants
M272 Sub-Codes Explained - Which One Is in Your Car-
The M272 family covers several raw sub-codes that share the same core 90-degree V6 architecture but differ by displacement, intake manifold design, and calibration. Identifying your exact sub-code is critical, as components like the intake manifold, ECU, and engine mounts are not universally interchangeable. - Fitted to: Mercedes C-Class (W203 C230) - Key technical difference: The smallest displacement variant in the family, featuring a specific intake manifold and lower-output calibration. - Sub-code-specific failure note: Shares the family balance shaft and timing chain wear pattern. - Interchange note: Not a straight swap with 3.0L or 3.5L variants; the ECU, wiring loom, and exhaust systems differ significantly. - Fitted to: Mercedes C-Class (W203/W204 C280), Mercedes E-Class (W211 E280), CLK (C209) - Key technical difference: The mid-range 3.0-litre variant, widely used as the standard V6 option before the 3.5L took over. - Sub-code-specific failure note: Shares the family balance shaft pattern; intake manifold runner flaps can also stick, causing rough idle. - Interchange note: Physically similar to the .960 but requires the correct ECU calibration and specific exhaust routing to run safely. - Fitted to: Mercedes S-Class (W221 S350), Mercedes E-Class (W212 E350) - Key technical difference: Updated 3.5-litre variant with revised intake geometry and higher output, often paired with updated 7G-TRONIC PLUS transmissions. - Sub-code-specific failure note: Shares the family timing chain pattern, though later production years saw minor metallurgy improvements to the sprockets. - Interchange note: Cannot be swapped with early 3.5L (.960) units without extensive ECU and wiring modifications due to updated sensor layouts. - Fitted to: Mercedes C-Class (W203/W204 C350), Mercedes E-Class (W211 E350), Mercedes ML (W164 ML350) - Key technical difference: The original high-output 3.5-litre variant, featuring the notorious early-batch balance shaft sprockets (highest risk group). - Sub-code-specific failure note: Highest incidence of balance shaft sprocket wear within the entire M272 family.
The M272 engine code is stamped on a machined pad on the engine block, typically near the oil filter housing or bell housing. It is also clearly listed on your vehicle's V5C registration document under "Engine Number". Enter your registration above to confirm your exact M272 fitment before any quotes are sent.
Easily Confused
M112
- The long-running 2.6L-3.2L V6 the M272 replaced in 2004; it used a conventional timing belt arrangement and did not suffer from the M272's notorious balance shaft sprocket wear.
Alternative / Next-Gen Code
M276
- The direct 3.5L V6 successor introduced from 2011, featuring a revised timing chain architecture and, in later variants, direct injection, largely resolving the balance shaft and camshaft adjuster vulnerabilities of the M272.
Related JLR Variants
M273
- The 4.6L/5.5L V8 counterpart of the same modular family, fitted to higher-spec S-Class and E-Class models; owners of V8-powered cars should look here, as the M273 shares the same balance shaft architecture but differs in displacement and mounting.
Confirm the exact M272 fitment
The M272 engine code is stamped on a machined pad on the engine block, typically near the oil filter housing or bell housing. It is also clearly listed on your vehicle's V5C registration document under "Engine Number". Enter your registration above to confirm your exact M272 fitment before any quotes are sent.
Buying Guide
Buying a Replacement Mercedes M272 - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used Mercedes M272 is only advisable for lower-mileage host vehicles and *only* if accompanied by documented, stamped proof that the balance shaft sprockets and timing chain have been replaced with updated components. Without this history, the risk of inheriting the same catastrophic chain-jump issues is unacceptably high.
Reconditioned:
This is the most recommended route for the M272. A proper reconditioned unit will include brand-new, updated balance shaft sprockets, a full timing chain kit, and refreshed cooling system components, directly addressing the engine's known weak points out of the box.
Rebuilt:
A full rebuild is justified if your original M272 suffered a jumped timing chain that damaged the cylinder head, valves, or pistons. A specialist rebuild will machine the block, fit updated timing components, and ensure all oil galleries are clear of debris from the failed chain.
Supply & Fit Line:
Sourcing a replacement is only half the job. Our network provides full supply and fit services, ensuring the engine is installed by Mercedes-specialist technicians with a nationwide warranty backing both the labour and the unit.
Vehicle Value Note:
For older hosts like the W203 C-Class or W211 E-Class, current UK market values typically sit between £2,500 and £7,000 . With a reconditioned M272 replacement costing from £3,800 (plus fitting), the repair cost can easily exceed 60-80% of the vehicle's current market value. In these cases, we strongly advise evaluating the car's scrap or part-exchange value before committing to a full engine replacement.
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Related Engines
Engines Related to the Mercedes M272
Explore engines that are closely related to the Mercedes-Benz M272, including its predecessor, successor, and key family variants.
Predecessor
M112
- The long-running 2.6L-3.2L V6 the M272 replaced in 2004; it used a conventional timing belt arrangement and did not suffer from the M272's notorious balance shaft sprocket wear.
Successor
M276
- The direct 3.5L V6 successor introduced from 2011, featuring a revised timing chain architecture and, in later variants, direct injection, largely resolving the balance shaft and camshaft adjuster vulnerabilities of the M272.
Sibling
M273
- The 4.6L/5.5L V8 counterpart of the same modular family, fitted to higher-spec S-Class and E-Class models; owners of V8-powered cars should look here, as the M273 shares the same balance shaft architecture but differs in displacement and mounting.
FAQ
Mercedes M272Frequently Asked Questions
Question 1How much does a Mercedes M272 engine replacement cost in the UK-
A Mercedes M272 engine replacement typically costs between £3,800 and £6,500 for a reconditioned supply-only unit . Fitted costs generally add £780-£1,040 for independent specialist labour, and fully rebuilt units with upgraded balance shaft components can reach £5,500-£8,500 supply-only.
- Fitted costs generally add £780-£1,040 for independent specialist labour.
- Fully rebuilt units with upgraded balance shaft components can reach £5,500-£8,500 supply-only.
Question 2What is the most common failure with the Mercedes M272 engine-
The most documented failure pattern for the M272 is balance shaft sprocket wear and timing chain stretch, typically occurring between 60,000 and 100,000 miles. Early warning signs include a distinct metallic rattling noise on cold starts and check engine lights for camshaft correlation faults, and if ignored, the chain can jump teeth, causing catastrophic valve-to-piston contact.
- Early warning signs include a distinct metallic rattling noise on cold starts and check engine lights for camshaft correlation faults.
- If ignored, the chain can jump teeth, causing catastrophic valve-to-piston contact.
Question 3Which Mercedes models use the M272 engine-
The M272 is fitted to Mercedes-Benz core models from 2004 to 2011, including the C-Class (W203, W204), E-Class (W211, W212), CLK (C209), CLS (C219), S-Class (W221), and ML/GL (W164). It powers badges ranging from the C230 and E280 to the S350 and ML350, and you should always verify your exact sub-code via registration lookup before ordering parts.
- It powers badges ranging from the C230 and E280 to the S350 and ML350.
- You should always verify your exact sub-code via registration lookup before ordering parts.
Question 4Should I buy a used or reconditioned Mercedes M272 engine-
A reconditioned Mercedes M272 is strongly recommended over a used unit due to the well-documented balance shaft sprocket and timing chain failure risks. Used units carry a high probability of inheriting the same latent wear unless accompanied by stamped proof of a full chain and sprocket kit replacement, whereas a proper reconditioned M272 includes new, updated balance shaft sprockets, a full timing chain kit, and refreshed cooling components as standard.
- Used units carry a high probability of inheriting the same latent wear unless accompanied by stamped proof of a full chain and sprocket kit replacement.
- A proper reconditioned M272 includes new, updated balance shaft sprockets, a full timing chain kit, and refreshed cooling components as standard.
Question 5What is the difference between the M272.920, M272.940, M272.950, and M272.960-
The M272.920 is a 2.5L variant, the M272.940 is a 3.0L variant, and the M272.950/M272.960 are 3.5L variants. They all share the same core 90-degree V6 architecture and the same balance shaft vulnerability, but they differ in displacement, intake manifold design, and ECU calibration, meaning they are not direct interchange replacements without extensive modifications.
- They all share the same core 90-degree V6 architecture and the same balance shaft vulnerability.
- However, they differ in displacement, intake manifold design, and ECU calibration, meaning they are not direct interchange replacements without extensive modifications.
Compare Mercedes M272 Engine Prices Today
Get a free, no-obligation comparison for your exact Mercedes M272 engine code and sub-code. Our registration lookup confirms your precise fitment before any quotes are sent, ensuring you receive accurate pricing for your specific vehicle. With reconditioned M272 units starting from an estimated £3,800, comparing specialist quotes takes just two minutes and could save you hundreds on your replacement.
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Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
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