The Mercedes — Benz M272.947 is a 3,498 cc, V6 petrol engine produced between 2005 and 2011. It features variable valve timing (VVT) on both intake and exhaust camshafts, sequential multi — point fuel injection, and an aluminium block and head, delivering smooth power delivery and refined operation. In standard tune it produced 180 kW (245 PS), with higher — output versions reaching 200 kW (272 PS) and torque outputs between 310–350 Nm, making it ideal for mid — size luxury ap…
All production years (2005–2011) meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/5680).
The Mercedes-Benz M272.947 is a 3,498 cc V6 petrol engine engineered for mid-size luxury models (2005–2011). It combines variable valve timing with sequential multi-point injection to deliver smooth power delivery and linear throttle response. Designed to meet Euro 4 standards, it balances refinement with performance in rear-wheel-drive platforms.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,498 cc | |
Fuel type | Petrol | |
Configuration | 60° V6, DOHC, 24-valve with dual VVT | |
Aspiration | Naturally aspirated | |
Bore × stroke | 92.9 mm × 86.0 mm | |
Power output | 180–200 kW (245–272 PS) | |
Torque | 310–350 Nm @ 2,500–5,200 rpm | |
Fuel system | Sequential multi-point injection (ME 2.1) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.7:1 | |
Cooling system | Water-cooled, mechanical coolant pump | |
Turbocharger | N/A | |
Timing system | Dual chain (front-mounted), interference design | |
Oil type | MB 229.5 (SAE 5W-40) | |
Dry weight | 185 kg |
The Mercedes-Benz M272.947 was used across Mercedes-Benz's W211/W203/R230 platforms with longitudinal mounting and shared with Ferrari under engine partnership agreements. This engine received platform-specific adaptations-reinforced mounts in the E-Class and revised intake manifolds in the SL-Class-and from 2008 the facelifted E-Class W211 LCI adopted the M272DE35 with updated cam followers, creating interchange limits. Partnerships allowed Ferrari's 4.3L V8 units to share valve train technology. All adaptations are documented in OEM technical bulletins.
The M272.947's primary reliability risk is inlet cam follower wear on early builds, with elevated incidence in high-temperature environments and urban driving. Internal Mercedes quality reports from 2009 indicated a notable share of pre-2008 engines requiring cam follower replacement before 150,000 km, while UK DVSA records show increased misfire-related MOT failures linked to valve train wear in poorly maintained units. Extended oil intervals and high ambient temperatures increase wear risk, making oil quality and interval adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2008-2011) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
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The M272.947 offers smooth performance and refinement, but early models (2005-2007) had cam follower reliability concerns. Later revisions (post-2008) improved durability with updated components, so well-maintained examples can exceed 200,000 km. Regular servicing with MB 229.5 oil and adherence to 15,000 km intervals greatly enhance longevity.
Key issues include inlet cam follower wear, intake manifold carbon buildup, mechanical coolant pump failure, and ignition coil faults. These are documented in Mercedes-Benz service bulletins, particularly SIB 230070/08 for cam follower concerns. Using correct oil and timely maintenance are essential preventative measures.
This 3.5L V6 petrol was used in the E-Class (W211), C-Class (W203), and SL-Class (R230) from 2005-2011. It powered variants including E350, C350, and SL350. Ferrari also used valve train technology derived from this engine in the F430 (2004-2009).
Yes. The M272 is moderately tunable via ECU remap. Stage 1 tunes typically add +20-30 kW safely, as stock internals handle mild increases. Aftermarket upgrades (exhaust, intake) allow further gains. Tuning requires premium fuel (RON 98) and robust cooling to prevent knock or misfires.
In an E350 (200 kW) from 2007, combined consumption is ~9.8 L/100 km (~29 mpg UK). Highway driving can achieve ~7.5 L/100 km (~38 mpg UK). Real-world figures vary, but expect 25-35 mpg UK on mixed roads. Performance variants (SL350) consume more under spirited driving.
Yes. The M272.947 uses an interference valvetrain design. If the timing chain fails, piston-to-valve contact is likely, potentially causing severe internal engine damage. Timing chain replacement is recommended per service schedule to prevent catastrophic failure.
Mercedes specifies MB 229.5 (5W-40) synthetic oil. This formulation is essential for high-temperature protection of the cam follower system. Change oil every 15,000 km or annually to prevent premature wear and maintain valve train integrity.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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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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