The Mercedes — Benz M 274.923 is a 1,991 cc, inline — four turbocharged petrol engine produced between 2013 and 2017. It features direct fuel injection (BlueDIRECT), twin — scroll turbocharging, and variable valve timing on both intake and exhaust camshafts. In standard tuning, it delivered 155 kW (211 PS) and 350 Nm of torque, offering strong mid — range performance and responsive throttle characteristics.
Fitted to compact and mid — size platforms including the W176 A — C…
All production years 2013–2017 meet Euro 6 emissions standards .
The Mercedes-Benz M 274.923 is a 1,991 cc inline-four turbocharged petrol engine engineered for compact and mid-size luxury applications (2013–2017). It combines direct injection with twin-scroll turbocharging to deliver responsive performance and improved fuel efficiency. Designed to meet Euro 6 standards, it balances drivability with emissions compliance in transverse-mounted configurations.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,991 cc | |
Fuel type | Petrol | |
Configuration | Inline-four, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 83.0 mm × 92.0 mm | |
Power output | 155 kW (211 PS) @ 5,500 rpm | |
Torque | 350 Nm @ 1,200–4,000 rpm | |
Fuel system | Direct injection (BlueDIRECT), multi-point injection (port) for cold starts | |
Emissions standard | Euro 6 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single twin-scroll turbocharger (BorgWarner) | |
Timing system | Dual chain (short-block to cylinder head) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 148 kg |
The Mercedes-Benz M 274.923 was used across Mercedes-Benz's W176, W205, and X156 platforms with transverse mounting. This engine received platform-specific calibrations-adaptive throttle response in the C-Class and revised torque delivery in the GLA-Class-and from 2015, minor internal revisions improved fuel pump durability, creating service part 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 274.923 is a modern, compact inline-four with strong performance, but pre-2015 models are prone to high-pressure fuel pump wear if oil changes are delayed. Later revisions improved durability, so well-maintained engines can exceed 150,000 km. Using MB 229.51 oil and adhering to 15,000 km service intervals is essential for longevity.
The primary issues are high-pressure fuel pump wear (causing hard starts and misfires), oil leaks from ageing valve cover gaskets, and ignition coil failures leading to misfires. Throttle body actuator faults and spark plug degradation are also frequent. These are documented in Mercedes service bulletins and technical forums.
This 2.0L turbo petrol was used in several compact and mid-size models: A-Class (W176) A 250 (2013–2018), C-Class (W205) C 250 (2014–2017), CLA-Class (C117) CLA 250 (2013–2017), and GLA-Class (X156) GLA 250 (2014–2017). All models meet Euro 6 emissions standards.
Aftermarket ECU tuning is common on the M274923 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Efficient for a performance turbo-four. In a C 250 (W205), combined consumption is ~7.0 L/100km (~40 mpg UK). City driving may reach 9–11 L/100km (~31–26 mpg), while highway cruising can achieve ~6.0 L/100km (~47 mpg). Real-world figures depend on driving style, but expect 30–40 mpg (UK) in mixed conditions.
Yes. The M 274 series is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. Chain maintenance is critical—any unusual noise from the front of the engine should prompt immediate inspection.
Mercedes specifies SAE 0W-40 oil meeting MB 229.51 standard. This low-ash, high-detergent formulation protects the high-pressure fuel pump and maintains engine cleanliness. Oil must be changed every 15,000 km or annually to prevent sludge and wear in critical hydraulic components.
Comprehensive technical documentation and regulatory references
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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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