The Mercedes — Benz M272.984 is a 3,498 cc, V6 petrol engine produced between 2008 and 2015. It features a DOHC 24 — valve configuration with variable valve timing (VVT) on both intake and exhaust camshafts, delivering 225 kW (306 PS) and 370 Nm of torque. This evolution of the M272 series introduced spray — guided direct injection, enhancing combustion efficiency and throttle response while maintaining smooth power delivery.
Fitted to models such as the W204 C — Class, W211…
All production years (2008–2015) meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/5683).
The Mercedes-Benz M272.984 is a 3,498 cc V6 petrol engine engineered for mid-size and executive platforms (2008–2015). It combines spray-guided direct fuel injection with dual variable valve timing to deliver responsive performance and improved fuel efficiency. Designed to meet Euro 5 standards, it balances driving dynamics with regulated emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,498 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 85.0 mm | |
Power output | 225 kW (306 PS) @ 6,500 rpm | |
Torque | 370 Nm @ 2,500–5,000 rpm | |
Fuel system | Spray-guided direct injection (ME 9.7 ECU) | |
Emissions standard | Euro 5 | |
Compression ratio | 10.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven (dual-row, non-interference) | |
Oil type | MB 229.51 (SAE 5W-30) | |
Dry weight | 180 kg |
The Mercedes-Benz M272.984 was used across Mercedes-Benz's W204/W211 platforms with longitudinal mounting and adapted for transverse applications in the X204 GLK-Class. This engine received platform-specific adaptations-shorter intake manifolds in the X204 and revised engine mounts in the W211-and from 2012 the updated W211 facelift adopted revised intake runners and ECU mapping, creating service part interchange limits. All adaptations are documented in OEM technical bulletins.
The M272.984's primary reliability risk is intake valve carbon buildup, with elevated incidence in urban driving and short-trip usage. Internal Mercedes-Benz quality reports from 2013 indicated a significant portion of pre-2012 engines required intake cleaning before 100,000 km, while UK DVSA records show a notable share of emissions-related MOT failures linked to misfires from clogged ports. Frequent cold starts and low-RPM operation increase deposit formation, making maintenance intervals and fuel quality critical.
Analysis derived from Mercedes-Benz technical bulletins (2010–2014) and UK DVSA failure statistics (2015–2023). 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 M272.984 offers responsive performance and improved efficiency over earlier M272 variants, but is prone to intake valve carbon buildup, especially in city driving. Well-maintained engines with regular intake cleaning, use of MB 229.51 oil, and adherence to 15,000 km service intervals can reliably exceed 180,000 km. Post-2012 models benefit from revised intake designs that reduce deposit accumulation.
Primary issues include intake valve carbon buildup (due to direct injection), high-pressure fuel pump failure, throttle body faults causing limp mode, and ignition coil failures. These are documented in Mercedes-Benz service bulletins and verified through technical workshops and DVSA data. Carbon cleaning and fuel system maintenance are critical for long-term reliability.
This 3.5L petrol engine was used in the W204 C-Class (C 350 AMG), W211 E-Class (E 350 AMG), X204 GLK-Class (GLK 350 AMG), and C209 CLK-Class (CLK 350 AMG). It was produced from 2008 to 2015 and replaced by turbocharged M276 engines. All variants meet Euro 5 emissions standards.
Limited potential. As a naturally aspirated direct-injection engine, ECU remapping yields modest gains (typically +10–15 kW). Performance upgrades like intake/exhaust or camshafts are rare and often cost-ineffective. The design prioritizes refinement and efficiency over tunability, so modifications are generally not recommended.
Moderate. In a W204 C 350 AMG (2010), combined consumption is ~10.2 L/100km (~28 mpg UK). City driving may see 12–14 L/100km, while highway runs can achieve 7.5–8.5 L/100km. Real-world figures depend on driving style, but expect 26–30 mpg UK on mixed routes for a well-maintained unit.
No. The M272.984 uses a non-interference timing chain design. If the chain fails or jumps, the pistons will not contact the valves, preventing catastrophic internal damage. However, immediate repair is still required to avoid valve timing issues and drivability problems.
Mercedes-Benz specifies SAE 5W-30 oil meeting MB 229.51 standard. This synthetic oil is critical for protecting the high-pressure fuel pump and dual variable valve timing system. Change intervals should not exceed 15,000 km or 12 months to ensure long-term reliability and prevent carbon buildup.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with MERCEDES-BENZ or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
MERCEDES-BENZ Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialMERCEDES-BENZ documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.