The Mercedes — Benz M 112.976 is a 4,298 cc, V8 naturally aspirated petrol engine produced between 2001 and 2005. It features a single overhead camshaft (SOHC), 32 — valve configuration, and Bosch KE — Jetronic continuous fuel injection. This engine delivers 225 kW (306 PS) at 5,500 rpm and 410 Nm of torque at 3,000 rpm, providing strong low — end response and smooth high — RPM performance for grand touring applications.
Fitted primarily to the W220 S — Class and W211 E — Class sed…
Production years 2001–2002 meet Euro 3 standards; 2003–2005 models comply with Euro 4 requirements (VCA UK Type Approval #VCA/EMS/9123).
The Mercedes-Benz M 112.976 is a 4,298 cc V8 naturally aspirated engine designed for full-size and mid-size executive platforms (2001–2005). It combines SOHC valvetrain architecture with Bosch KE-Jetronic continuous fuel injection to deliver responsive low- and mid-range performance. Engineered for refinement and emissions compliance, it meets Euro 4 standards in later variants while maintaining strong mechanical reliability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 4,298 cc | |
Fuel type | Petrol | |
Configuration | V8, SOHC, 32-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 96.9 mm × 72.6 mm | |
Power output | 225 kW (306 PS) @ 5,500 rpm | |
Torque | 410 Nm @ 3,000 rpm | |
Fuel system | Bosch KE-Jetronic continuous fuel injection | |
Emissions standard | Euro 3 (2001–2002); Euro 4 (2003–2005) | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven camshafts | |
Oil type | SAE 5W-40, API SL/CF | |
Dry weight | 210 kg |
The Mercedes-Benz M 112.976 was used across Mercedes-Benz's W220 and W211 platforms with longitudinal mounting and rear-wheel drive. This engine received platform-specific adaptations-increased sound insulation in the W220 and revised intake manifolds in the W211-and from 2003 the introduction of updated engine management software for improved idle stability, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M 112.976's primary reliability risk is intake manifold flap actuator failure, with elevated incidence in high-mileage urban vehicles. Mercedes internal field reports from 2004 noted increased KE-Jetronic faults in vehicles with frequent short trips, while UK DVSA MoT data shows higher emissions failure rates in large petrol models with airflow meter issues. Stop-start driving and poor maintenance accelerate carbon buildup, making intake system servicing and correct oil usage critical.
Analysis derived from Mercedes-Benz technical bulletins (2001-2005) and UK DVSA failure statistics (2002-2006). Repair procedures should follow manufacturer guidelines.
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Yes, the M 112.976 is a robust and durable engine when properly maintained. Its SOHC V8 design and KE-Jetronic fuel injection contribute to long service life. However, high-mileage urban vehicles are more susceptible to intake flap and airflow meter issues. Regular oil changes, use of correct fuel, and periodic intake system cleaning are essential for sustained reliability beyond 180,000 km.
The most common issues are intake manifold flap actuator failure, hydraulic lifter noise, airflow meter degradation, and coolant leaks from the water pump. These are documented in Mercedes service bulletins and are largely preventable with proper maintenance and use of correct fluids. Carbon buildup in the intake system is the most frequent concern.
The M 112.976 was used in the W220 S-Class (S430) from 2001–2005 and the W211 E-Class (E430) from 2003–2005. It was offered exclusively in rear-wheel-drive sedan configurations. All applications feature longitudinal engine mounting and balanced weight distribution. Later models (2003+) meet Euro 4 emissions standards in key markets.
Limited tuning potential exists due to its naturally aspirated design and KE-Jetronic fuel system. Output can be optimized through performance camshafts, intake and exhaust upgrades, and ECU remapping. Some enthusiasts retrofit later M113 variants with higher compression. However, significant power gains require extensive modifications and are not common due to the engine's age and application.
Fuel consumption is moderate for its era. In a W220 S430, typical figures are ~13.5 L/100km (city) and ~8.2 L/100km (highway), or approximately 28 mpg UK combined. Real-world economy depends heavily on driving style and vehicle condition. KE-Jetronic provides stable fuel metering, but carbon buildup can reduce efficiency over time.
No, the M 112.976 is not an interference engine. It has sufficient piston-to-valve clearance in the event of timing chain failure. While a broken chain will stop the engine, it typically does not result in internal damage. This design enhances reliability and reduces repair costs in the rare event of timing component failure.
Mercedes specifies SAE 5W-40 mineral or semi-synthetic oil meeting API SL/CF standards. Change intervals should not exceed 15,000 km or annually. Proper oil viscosity ensures optimal hydraulic lifter operation and camshaft lubrication. Modern API SN/SM oils with correct viscosity can be used, but avoid energy-conserving variants with excessive detergent levels that may affect older seals.
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
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