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 .
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 | Refer to vehicle handbook / manufacturer specification | |
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.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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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.
Aftermarket ECU tuning is common on the M272943 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
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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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
Type-approval guidance and documentation.
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