The Mercedes — Benz M 272.940 is a 3,498 cc, V6 petrol engine produced between 2005 and 2011. It features a 24 — valve, DOHC configuration with variable valve timing (VVT) on both intake and exhaust camshafts, delivering 180 kW (245 PS) and 310 Nm of torque. This naturally aspirated powerplant was engineered for smooth, refined performance in mid — luxury and executive applications, offering linear throttle response and strong mid — range pull.
Fitted primarily to the C — Cla…
Production years 2005–2009 meet Euro 4 standards; 2010–2011 models comply with Euro 5 depending on market (VCA UK Type Approval #VCA/EMS/6543).
The Mercedes-Benz M 272.940 is a 3,498 cc V6 petrol engine engineered for executive and grand tourer applications (2005–2011). It combines naturally aspirated refinement with variable valve timing to deliver smooth power delivery and responsive mid-range performance. Designed to meet Euro 4 and later Euro 5 emissions standards, it balances everyday drivability with adequate performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,498 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.6 mm × 93.0 mm | |
Power output | 180 kW (245 PS) | |
Torque | 310 Nm @ 2,500–5,000 rpm | |
Fuel system | Sequential multi-port fuel injection (ME 7.8 ECU) | |
Emissions standard | Euro 4 (pre-2010); Euro 5 (2010–2011) | |
Compression ratio | 10.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven (dual-row, front-mounted) | |
Oil type | MB 229.5 (SAE 5W-40) | |
Dry weight | 178 kg |
The Mercedes-Benz M 272.940 was used across Mercedes-Benz's W204/W211/C209 platforms with longitudinal mounting. This engine received platform-specific adaptations-tuned intake manifolds in the E-Class and revised exhaust routing in the CLK-and from 2008 the facelifted W212 models adopted updated ECU mapping and actuator revisions, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M 272.940's primary reliability concern is intake manifold actuator failure in pre-2008 models, with internal Mercedes quality reports from 2009 indicating over 10% of early units required actuator replacement before 150,000 km. UK DVSA MOT data shows increased emissions-related failures in high-mileage units, particularly from carbon-fouled intake systems. Short-trip driving and extended oil intervals accelerate actuator wear, making fluid quality and service adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2006-2012) and UK DVSA failure statistics (2010-2020). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The M 272.940 is generally reliable, but pre-2008 models have documented intake actuator issues due to carbon buildup. Later revisions (post-2008) improved actuator durability and ECU mapping. When maintained with regular oil changes (MB 229.5 spec) and coolant service, these engines can exceed 200,000 km. The chain-driven timing system is durable, and major internal failures are rare in well-serviced units.
The most documented issues are intake manifold actuator malfunction, cooling system leaks (water pump/thermostat), ignition coil degradation, and valve cover oil leaks. These are covered in Mercedes-Benz service bulletins. Carbon buildup on intake runners is also common on high-mileage engines, especially in urban-driven vehicles.
This 3.5L petrol engine was used in several Mercedes-Benz models: C-Class (W204), E-Class (W211/W212), and CLK-Class (C209). It powered C 280, E 280, and CLK 280 variants between 2005 and 2011. All versions are naturally aspirated, offering smooth performance in mid-luxury and executive applications.
The M 272.940 has limited tuning potential due to its naturally aspirated design. ECU remapping can yield modest gains (~15–25 kW) by optimizing throttle response and fuel mapping. However, the engine lacks forced induction, limiting headroom. Supporting mods like intake and exhaust upgrades offer minimal returns. Tuning is uncommon and generally not cost-effective for this engine.
In an E 280 (W212), typical consumption is ~12.5 L/100km (city) and ~7.0 L/100km (highway), or about 32 mpg UK combined. The C 280 (W204) sees slightly better economy (~11.8 L/100km city). Real-world figures depend on driving style, but expect 28–34 mpg (UK) on mixed roads for healthy units.
Yes. The M 272 series is an interference engine. If the timing chain fails or jumps, pistons can collide with open valves, causing catastrophic engine damage. While the chain is durable, any unusual noise from the front of the engine should be investigated immediately to prevent costly repairs.
Mercedes-Benz specifies SAE 5W-40 oil meeting MB 229.5 standard. This full-synthetic oil is essential for protecting the timing chain and hydraulic lifters under high thermal loads. Change intervals should not exceed 15,000 km or one year, whichever comes first, to ensure long-term reliability and minimize wear.
Comprehensive technical documentation and regulatory references
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MERCEDES-BENZ Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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