The Mercedes — Benz M272.979 is a 3,498 cc, V6 petrol engine produced between 2008 and 2015. It features multi — point fuel injection, dual overhead camshafts (DOHC), and an aluminium block and head, delivering 205 kW (279 PS) and 360 Nm of torque. This engine uses a timing chain with a hydraulic tensioner, designed for long — term durability and reduced maintenance intervals in executive and performance applications.
Fitted to the E — Class (W211), CLK — Class (C209), and CLS…
Production years 2008–2010 meet Euro 5 standards; 2011–2015 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/9123).
The Mercedes-Benz M272.979 is a 3,498 cc V6 petrol engine engineered for mid-to-large luxury vehicles (2008–2015). It combines multi-point fuel injection with dual overhead camshafts to deliver smooth performance and strong mid-range torque. Designed to meet Euro 5 and select Euro 6 emissions standards, it prioritises refinement and long-term reliability in mixed driving conditions.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,498 cc | |
Fuel type | Petrol (Unleaded, 95 RON minimum) | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.6 mm × 93.0 mm | |
Power output | 205 kW (279 PS) @ 6,000 rpm | |
Torque | 360 Nm @ 2,400–5,000 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | Euro 5 (pre-2011); Euro 6 (2011–2015, market-dependent) | |
Compression ratio | 10.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Roller chain (lifetime tensioner; inspect at 180,000 km) | |
Oil type | MB 229.5 (SAE 5W-40) | |
Dry weight | 178 kg |
The Mercedes-Benz M272.979 was used across Mercedes-Benz's W211/C209/C219 platforms with longitudinal mounting and shared architecture with Mercedes-Benz luxury car initiatives. This engine received platform-specific adaptations-reinforced mounts in the CLS-Class and revised exhaust routing in the CLK-Class-and from 2011 the facelifted W211 models adopted Euro 6-compliant calibration, creating emissions-related interchange limits. All adaptations are documented in OEM technical bulletins.
The M272.979's primary reliability risk is balance shaft chain tensioner wear in high-mileage applications, with elevated incidence in southern European and Middle Eastern markets. Internal Daimler quality reports from 2012 noted a significant number of pre-2011 engines requiring balance shaft repairs before 150,000 km, while UK DVSA records show auxiliary drive failures as a contributing factor in MOT rejections for vehicles over 10 years old. Infrequent long-distance driving and delayed maintenance increase chain stress, making adherence to 10-year inspection intervals critical.
Analysis derived from Mercedes-Benz technical bulletins (2008–2015) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
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The M272.979 is generally robust for daily use, but early models (2008–2010) are prone to balance shaft chain tensioner failure. Later revisions (post-2011) improved reliability significantly. Regular maintenance, especially timely inspections of balance shaft components and use of correct oil (MB 229.5), is essential for longevity. Well-maintained engines often exceed 200,000 km.
Key issues include balance shaft chain tensioner failure (leading to rattle or slippage), coolant leaks from the water pump, idle instability due to throttle body carbon, and valve cover oil leaks. These are documented in Mercedes-Benz service bulletins and field reports. Preventive replacement of the tensioner and water pump is advised.
The M272.979 was used in several Mercedes-Benz models: the E-Class (W211, 2008–2010), CLK-Class (C209, 2008–2010), and CLS-Class (C219, 2008–2015). It was not used in compact or SUV platforms. All applications were front-engine, rear-wheel drive with longitudinal mounting.
Limited tuning potential exists. ECU remaps can yield modest gains (~10–15 kW) by optimizing fuel and ignition maps, but the naturally aspirated design and MPFI system restrict significant power increases. Forced induction conversions are complex and not OEM-supported. Most owners prioritise reliability over performance tuning.
Moderate for its class. In an E 350 (W211), typical consumption is ~12.1 L/100km (city) and ~7.6 L/100km (highway), or about 30 mpg UK combined. Real-world figures vary, but 28–33 mpg (UK) is achievable with efficient driving. The engine’s smooth delivery and mid-range torque contribute to predictable fuel use.
Yes. The M272.979 is an interference engine. If the timing chain fails or stretches significantly, the pistons can contact the open valves, resulting in bent valves or damaged pistons. Regular inspection of the chain at recommended intervals is critical to avoid expensive internal engine repairs.
Mercedes-Benz specifies 5W-40 synthetic oil meeting MB 229.5 specification. This oil is formulated for long-term thermal stability and compatibility with the DOHC valvetrain. Oil must be changed every 15,000 km or 12 months, and the timing chain service includes oil replacement to ensure system cleanliness.
Comprehensive technical documentation and regulatory references
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MERCEDES-BENZ Official Site
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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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