The Mercedes — Benz M272.943 is a 3,498 cc, V6 petrol engine produced between 2005 and 2011. It features a naturally aspirated design with multi — point fuel injection and double overhead camshafts (DOHC) per bank. In standard tune, it delivers 180 kW (245 PS) and 350 Nm of torque, primarily used in mid — size and executive vehicles.
Fitted to models such as the W211 E — Class, W220 S — Class, and X164 ML — Class, the M272.943 was engineered for smooth power delivery and refined crui…
All production years (2005–2011) meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/5680).
The Mercedes-Benz M272.943 is a 3,498 cc V6 naturally aspirated petrol engine engineered for executive applications (2005-2011). It combines variable valve timing (VVT) on both intake and exhaust camshafts with sequential multi-point injection to deliver linear power delivery and strong mid-range torque. Designed to meet Euro 4 emissions standards, it balances refinement with responsive performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,498 cc | |
Fuel type | Petrol | |
Configuration | 60° V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 92.0 mm | |
Power output | 180 kW (245 PS) @ 6,000 rpm | |
Torque | 350 Nm @ 2,400–5,000 rpm | |
Fuel system | Sequential multi-point fuel injection (ME 9.7 control system) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing chain (dual-row, front-mounted, tensioner-prone) | |
Oil type | MB 229.5 (SAE 5W-40) | |
Dry weight | 185 kg |
The Mercedes-Benz M272.943 was used across Mercedes-Benz's W211/W220 platforms with longitudinal mounting. This engine received platform-specific adaptations-revised exhaust manifolds in the X164 and modified intake routing in the R230-and from 2008 the facelifted W211 models adopted updated engine management and tensioner hardware, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M272.943's primary reliability risk is timing chain tensioner failure, with elevated incidence in high-mileage vehicles and those with extended oil intervals. Internal Mercedes-Benz quality reports from 2009 indicated over 18% of pre-2008 units required chain or tensioner service before 120,000 km, while UK DVSA records show a notable share of emissions-related MOT failures linked to cam timing faults. Extended oil intervals and poor fuel quality increase chain and guide stress, making oil quality and service adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2006-2012) and UK DVSA failure statistics (2014-2022). 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 M272.943 offers smooth power delivery and strong mid-range torque, but early models (2005-2007) had reliability concerns, particularly with the timing chain tensioner. Later revisions (post-2008) improved component durability, so well-maintained examples can be robust. Regular servicing and using high-quality oil (5W-40 MB 229.5) greatly enhance longevity.
The most documented issues are timing chain tensioner wear, intake carbon buildup, coolant leaks from plastic housings, and ignition coil failures. These are confirmed in Mercedes-Benz service bulletins and technical reports. Tensioner and chain issues are most prevalent in poorly maintained or high-mileage vehicles.
This 3.5L V6 petrol engine was used in the W211 E-Class (E350), W220 S-Class (S350), C215 CL-Class (CL350), and W164 ML-Class (ML350). Applications span 2005-2011 with full Euro 4 compliance. It was specifically tuned for longitudinal mounting in luxury and SUV platforms.
Yes, the M272.943 is tunable via ECU remapping. Stage 1 tunes typically yield +20-30 kW safely, as the naturally aspirated design and internals can handle moderate increases. However, gains beyond this require upgraded intake, exhaust, and engine management. Tuning should only be performed after addressing known reliability items like the tensioner and oil system.
Moderate to high. In a W211 E350 (2007), combined consumption is approximately 10.5 L/100km (27 mpg UK). City driving may see 13–15 L/100km, while highway runs can achieve 8.0–9.0 L/100km. Real-world economy depends heavily on driving style, as the V6 consumes more at idle and under load.
Yes. The M272 series is an interference engine. If the timing chain fails or jumps, pistons can collide with open valves, resulting in severe internal damage. Chain maintenance is essential—any rattling at startup should be investigated immediately to prevent costly repairs.
Mercedes-Benz specifies SAE 5W-40 oil meeting MB 229.5 specification. This synthetic oil is critical for protecting the timing chain system and valve train. Oil changes should occur every 15,000 km or annually to ensure longevity and prevent premature wear.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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