The Mercedes — Benz M 111.975 is a 2,295 cc, inline — four naturally aspirated petrol engine produced between 2000 and 2004. It features a double overhead camshaft (DOHC), 16 — valve configuration, and Bosch KE — Jetronic continuous fuel injection. This engine delivers 110 kW (150 PS) at 5,500 rpm and 210 Nm of torque at 3,500 rpm, providing smooth mid — range performance and refined cruising characteristics.
Fitted primarily to the W203 C — Class and W211 E — Class sedans—incl…
Production years 2000–2001 meet Euro 3 standards; 2002–2004 models comply with Euro 4 requirements .
The Mercedes-Benz M 111.975 is a 2,295 cc inline-four naturally aspirated engine designed for compact and mid-size executive platforms (2000–2004). It combines DOHC 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 | 2,295 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 94.6 mm | |
Power output | 110 kW (150 PS) @ 5,500 rpm | |
Torque | 210 Nm @ 3,500 rpm | |
Fuel system | Bosch KE-Jetronic continuous fuel injection | |
Emissions standard | Euro 3 (2000–2001); Euro 4 (2002–2004) | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven camshafts | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 142 kg |
The Mercedes-Benz M 111.975 was used across Mercedes-Benz's W203 and W211 platforms with longitudinal mounting and rear-wheel drive. This engine received platform-specific adaptations-increased sound insulation in the W211 and revised intake manifolds in the W203-and from 2002 the introduction of updated engine management software for improved idle stability, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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Yes, the M 111.975 is a robust and durable engine when properly maintained. Its DOHC 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 111.975 was used in the W203 C-Class (C200) from 2000–2004 and the W211 E-Class (E200) from 2002–2004. It was offered exclusively in rear-wheel-drive sedan configurations. All applications feature longitudinal engine mounting and balanced weight distribution. Later models (2002+) 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 M111 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 efficient for its era. In a W203 C200, typical figures are ~9.8 L/100km (city) and ~6.4 L/100km (highway), or approximately 35 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 111.975 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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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.
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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.
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