The Mercedes — Benz M 272.972 is a 3,498 cc, V6 petrol engine produced between 2008 and 2017. It features a 24 — valve, DOHC configuration with variable valve timing (VVT) on both intake and exhaust camshafts, delivering 205 kW (279 PS) and 370 Nm of torque. This naturally aspirated powerplant was engineered for refined, high — speed performance in executive and luxury applications, offering smooth throttle response and strong mid — range pull.
Fitted primarily to the E — Cla…
All production years (2008–2017) comply with Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/8901).
The Mercedes-Benz M 272.972 is a 3,498 cc V6 petrol engine engineered for executive and luxury applications (2008–2017). It combines naturally aspirated refinement with variable valve timing to deliver smooth power delivery and responsive mid-range performance. Designed to meet Euro 5 emissions standards, it balances everyday drivability with elevated 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 | 205 kW (279 PS) | |
Torque | 370 Nm @ 2,500–5,000 rpm | |
Fuel system | Sequential multi-port fuel injection (ME 7.8 ECU) | |
Emissions standard | Euro 5 | |
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 272.972 was used across Mercedes-Benz's W212/C218/W221 platforms with longitudinal mounting and paired with 7G-Tronic transmission. This engine received platform-specific adaptations-tuned intake manifolds in the E-Class and revised exhaust routing in the CLS-and from 2012 the facelifted W212 models adopted updated ignition coils and ECU mapping, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M 272.972's primary reliability concern is ignition coil degradation in pre-2012 models, with internal Mercedes quality reports from 2013 indicating over 8% of early units required coil replacement before 150,000 km. UK DVSA MOT data shows increased emissions-related failures in high-mileage units, particularly from carbon-fouled intake systems. Extended oil intervals and high-temperature operation accelerate coil failure, making fluid quality and service adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2010-2018) and UK DVSA failure statistics (2012-2020). 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 272.972 is generally reliable, but pre-2012 models have documented ignition coil issues due to heat soak. Later revisions (post-2012) improved coil 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 ignition coil degradation, cooling system leaks (water pump/thermostat), intake manifold flap malfunction, 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: E-Class (W212), CLS-Class (C218), and S-Class (W221). It powered E 350, CLS 350, and S 350 variants between 2008 and 2017. All versions are naturally aspirated, offering smooth performance in executive and luxury applications.
The M 272.972 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 350 (W212), typical consumption is ~13.0 L/100km (city) and ~7.5 L/100km (highway), or about 30 mpg UK combined. The S 350 (W221) sees slightly higher consumption (~14.0 L/100km city). Real-world figures depend on driving style, but expect 28–32 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
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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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