The Mercedes — Benz M266.980 is a 1,328 cc, inline — three petrol engine produced between 2005 and 2014. It was developed for compact urban vehicles, featuring multi — point fuel injection (M266.980 variant), SOHC, and 12 — valve configuration. Delivering 55 kW (75 PS) at 5,300 rpm and 110 Nm of torque at 3,750 rpm, it prioritizes compact packaging and fuel efficiency for city driving.
Fitted exclusively to the W169 A — Class (A 150, A 170) and early W168 A — Class facelift models…
Production years 2005–2008 meet Euro 4 standards; 2009–2014 models comply with Euro 5 depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Mercedes-Benz M266.980 is a 1,328 cc inline-three petrol engine engineered for compact front-wheel-drive platforms (2005–2014). It combines SOHC valvetrain architecture with multi-point fuel injection to deliver responsive city driving characteristics. Designed to meet Euro 4 and Euro 5 emissions standards, it balances space efficiency with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,328 cc | |
Fuel type | Petrol | |
Configuration | Inline-3, SOHC, 12-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 79.7 mm × 70.8 mm | |
Power output | 55 kW (75 PS) @ 5,300 rpm | |
Torque | 110 Nm @ 3,750 rpm | |
Fuel system | Multi-point fuel injection (ME 7.9.10) | |
Emissions standard | Euro 4 (pre-2009); Euro 5 (2009–2014, market-dependent) | |
Compression ratio | 10.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven (single-row, prone to tensioner wear) | |
Oil type | MB 229.5 (SAE 5W-40) | |
Dry weight | 89 kg |
The Mercedes-Benz M266.980 was used across Mercedes-Benz's W169 platform with transverse mounting. This engine received platform-specific adaptations-shorter accessory belts in pre-facelift A 150 variants-and from 2008 the facelifted W169 LCI models adopted revised intake manifolds and updated emissions calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M266.980's primary reliability risk is timing chain tensioner wear on early builds, with elevated incidence in urban stop-start use. Internal Mercedes-Benz quality reports from 2010 indicated a significant portion of pre-2009 engines required tensioner replacement before 150,000 km, while UK DVSA records show increased catalytic converter failures in short-trip-driven vehicles. Extended oil intervals and cold-start cycles increase wear, making oil quality and service adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2006-2013) and UK DVSA failure statistics (2012-2020). Repair procedures should follow manufacturer guidelines.
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The M266.980 offers solid efficiency and compact design, but early models (2005–2008) are prone to timing chain tensioner wear. Later revisions (post-2009) improved component durability. When maintained with regular oil changes using MB 229.5 (5W-40) oil, these engines can reliably exceed 180,000 km. Avoid extended service intervals to prevent premature wear.
The most documented issues include timing chain tensioner wear, idle instability due to throttle body carbon buildup, coolant leaks from the thermostat housing, and ignition coil failures. These are confirmed in Mercedes-Benz service bulletins and field reports. Preventive maintenance significantly reduces failure rates.
The M266.980 was used exclusively in the W169 A-Class (A 150, A 170) from 2005 to 2014. It was not shared with other Daimler Group brands. Euro 4 models were produced until 2008, with Euro 5-compliant versions continuing until 2014 in select European markets.
Limited tuning potential exists. ECU remaps can yield modest gains (~5–8 kW) by optimizing fuel and ignition maps, but the naturally aspirated design and SOHC valvetrain limit significant power increases. Aftermarket intake or exhaust upgrades offer minimal returns. Best suited for reliability-focused ownership rather than performance tuning.
Excellent for city use. In the A 150 (W169), combined consumption is approximately 6.1 L/100km (~46 mpg UK). Highway driving improves to ~5.0 L/100km (~57 mpg UK), while urban cycles may reach 7.5 L/100km (~38 mpg UK). Real-world economy depends on driving style, but expect 40–50 mpg (UK) under mixed conditions.
Yes. The M266.980 is an interference engine. If the timing chain fails or jumps, piston-to-valve contact is likely, resulting in severe internal damage. Immediate attention to any timing rattle or oil maintenance lapse is critical to avoid costly engine repairs.
Mercedes-Benz specifies SAE 5W-40 oil meeting MB 229.5 standard. This low-SAPS formulation ensures compatibility with emissions systems and protects the timing chain tensioner. Change oil every 15,000 km or annually, whichever comes first, to maintain engine longevity and prevent sludge buildup.
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)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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