The Mercedes — Benz M 271.860 is a 1,796 cc, inline — four petrol engine produced between 2004 and 2012. It features a naturally aspirated design with variable valve timing (VVT) and electronic fuel injection (EFI), delivering 115 kW (156 PS) and 210 Nm of torque. Its compact dimensions and smooth operation made it ideal for compact and mid — size platforms.
Fitted to models including the W203 C — Class, W245 B — Class, and W169 A — Class, the M 271.860 was engineered for responsiv…
Production years 2004–2009 meet Euro 4 standards; 2010–2012 models comply with Euro 5 .
The Mercedes-Benz M 271.860 is a 1,796 cc inline-four petrol engine engineered for compact and mid-size applications (2004–2012). It combines variable valve timing (VVT) with electronic fuel injection to deliver responsive throttle characteristics and smooth operation. Designed to meet Euro 4 and later Euro 5 emissions standards, it balances drivability with regulated efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,796 cc | |
Fuel type | Petrol (Unleaded, 95 RON min) | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.0 mm × 85.0 mm | |
Power output | 115 kW (156 PS) @ 5,900 rpm | |
Torque | 210 Nm @ 3,000–4,600 rpm | |
Fuel system | Electronic multi-point fuel injection (ME 2.1) | |
Emissions standard | Euro 4 (2004–2009); Euro 5 (2010–2012) | |
Compression ratio | 10.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing chain (single-row, front-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 148 kg |
The Mercedes-Benz M 271.860 was used across Mercedes-Benz's W203/W169 platforms with transverse mounting and adapted for front-wheel-drive applications. This engine received platform-specific adaptations-shortened intake manifolds in the A-Class and revised accessory drives in the C-Class-and from 2010 the Euro 5-compliant B-Class variants adopted updated catalytic converters, 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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The M 271.860 offers solid performance and refinement, but pre-2009 models are prone to intake camshaft wear if oil changes are delayed or incorrect oil is used. Later models (2009+) feature hardened camshafts that significantly improve durability. When maintained with MB 229.5 oil and 15,000 km service intervals, these engines can reliably exceed 200,000 km.
Key issues include intake camshaft lobe wear (especially pre-2009), throttle body actuator faults, coolant leaks from plastic components, and ignition coil failures. These are documented in Mercedes-Benz service bulletins and supported by DVSA failure data. Regular maintenance using correct fluids prevents most problems.
The M 271.860 was used in the W203 C-Class (C 180 Kompressor, 2004–2007), W169 A-Class (A 180, 2004–2012), and W245 B-Class (B 180, 2005–2012). It was phased out in favor of turbocharged M 270/M 274 engines. All variants are front-wheel drive with transverse engine layout.
Limited tuning potential exists. ECU remaps can yield +10–15 kW by optimizing throttle response and fuel maps, but gains are modest due to the naturally aspirated design. Intake/exhaust upgrades offer minor improvements. Over-tuning risks exceeding component limits, especially on pre-2009 camshafts. Reliability-focused tuning is recommended.
In combined driving, expect 7.8–8.5 L/100km (30–36 mpg UK). Highway consumption is ~6.5 L/100km (~43 mpg UK), while city driving may reach 10.0 L/100km (~28 mpg UK). Real-world economy depends on driving style and condition. The ME 2.1 system optimizes fuel delivery but benefits from regular maintenance.
Yes. The M 271.860 is an interference engine. If the timing chain fails or skips, pistons can contact open valves, causing catastrophic internal damage. The chain is durable when maintained, but any abnormal noise should prompt immediate inspection to avoid engine replacement.
Mercedes-Benz specifies SAE 5W-40 oil meeting MB 229.5 standard. This synthetic oil provides optimal protection for the camshafts and timing components. Oil must be changed every 15,000 km or annually to prevent accelerated wear, particularly on pre-2009 engines.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
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