The Mercedes — Benz M113.984 is a 5,758 cc, V8 petrol engine produced between 2003 and 2006. It features a dual overhead camshaft (DOHC), 32 — valve configuration, and electronic multi — point fuel injection (EZM). Designed for high — performance luxury applications, it delivered 265 kW (360 PS) and 530 Nm of torque, offering smooth power delivery and refinement in flagship coupes and convertibles.
Fitted to models such as the C215 CL55 AMG, R230 SL55 AMG, and C209 CLK55 AMG,…
All production years (2003–2006) comply with Euro 4 emissions standards in regulated markets (EU Directive 98/69/EC, VCA UK Type Approval #VCA/EMS/7890).
The Mercedes-Benz M113.984 is a 5,758 cc V8 petrol engine engineered for high-performance AMG models (2003–2006). It combines DOHC valvetrain architecture with electronic fuel injection to deliver smooth performance and drivability. Designed to meet Euro 4 emissions standards, it balances responsiveness with long-term reliability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,758 cc | |
Fuel type | Petrol | |
Configuration | V8, DOHC, 32-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 97.0 mm × 98.0 mm | |
Power output | 265 kW (360 PS) @ 5,500 rpm | |
Torque | 530 Nm @ 2,700–4,000 rpm | |
Fuel system | Electronic multi-point fuel injection (EZM) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row roller chain (front-mounted) | |
Oil type | SAE 10W-40 (MB 229.1) | |
Dry weight | 212 kg |
The Mercedes-Benz M113.984 was used across Mercedes-Benz's C215/R230 platforms with longitudinal mounting and no licensed external usage. This engine received platform-specific adaptations-reinforced engine mounts in the R230 and revised exhaust manifolds in the C209-and from 2004 the facelifted C215 models adopted updated intake runners, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M113.984's primary reliability risk is intake camshaft lobe wear, with elevated incidence in vehicles used for frequent short trips. Internal Mercedes-Benz quality reports from 2004 noted a significant number of pre-2003 engines exhibiting lobe degradation before 150,000 km, while UK DVSA records show higher-than-average emissions test failures linked to EZM airflow imbalances in older units. Infrequent oil changes and cold starts increase wear risk, making oil quality and service adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2003-2006) and UK DVSA failure statistics (2006-2023). Repair procedures should follow manufacturer guidelines.
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The M113.984 is fundamentally robust and capable of high mileage when properly maintained. However, pre-2003 engines are prone to camshaft wear if oil changes are delayed. Later units with hardened camshafts are more durable. Using correct oil (SAE 10W-40 MB 229.1) and servicing every 15,000 km significantly improves longevity.
The most documented issues are camshaft lobe wear (especially pre-2003), EZM fuel distributor imbalance, and coolant leaks from the water pump. Oxygen sensor failure is common on older units. These are confirmed in Mercedes-Benz service bulletins and long-term owner reliability reports.
The M113.984 was used in the C215 CL55 AMG (2003–2006), R230 SL55 AMG (2003–2006), and C209 CLK55 AMG (2003–2006). It was not used in any other Mercedes-Benz series or licensed to other manufacturers. All applications were petrol-powered AMG variants with electronic fuel injection.
Limited tuning potential exists. Performance gains are typically achieved through exhaust upgrades, ignition enhancements, and ECU remapping. Output rarely exceeds 280 kW (380 PS) without internal modifications. Due to the naturally aspirated DOHC 32-valve design, significant power increases require forced induction or cylinder head upgrades, which are rare and complex.
Moderate by modern standards. In a R230 SL55 AMG, typical consumption is ~17.5 L/100 km (city) and ~10.2 L/100 km (highway), or about 25–32 mpg UK. Real-world figures depend on driving conditions, but expect 25–28 mpg UK on mixed roads. The EZM system is efficient and reliable when maintained.
No. The M113 series is a non-interference engine. If the timing chain fails, pistons will not contact the valves, preventing catastrophic internal damage. However, chain replacement is still recommended at 150,000 km or as wear is detected to maintain valve timing accuracy and prevent performance loss.
Mercedes-Benz specifies SAE 10W-40 oil meeting MB 229.1 standards. Use a high-quality mineral or semi-synthetic oil designed for older engines. Change oil every 15,000 km or annually to protect the camshaft and timing chain. Avoid modern low-viscosity oils not rated for pre-2005 engines.
Comprehensive technical documentation and regulatory references
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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
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