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-Class, W205 C-Class, and X156 GLA-Class, the M 274.923 was engineered for agility and efficiency in front-wheel-drive and 4MATIC applications. Its design prioritized compact packaging, low weight, and high specific output. Emissions compliance was achieved through stratified lean-burn capability, exhaust gas recirculation (EGR), and close-coupled catalytic converters, meeting Euro 6 standards across its production run.
One documented concern involves premature wear of the high-pressure fuel pump drive shaft, highlighted in Mercedes-Benz Service Bulletin 70.00-P-0051/14. This fault can lead to fuel pressure loss, engine misfires, and non-start conditions. The issue stems from inadequate lubrication of the camshaft-driven pump under sustained high-load operation. Later production units received revised pump assemblies and updated oil change intervals to mitigate the risk.
All production years 2013–2017 meet Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/8765).
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 | MB 229.51 (SAE 0W-40) | |
| Dry weight | 148 kg |
The twin-scroll turbo provides strong low-RPM torque ideal for urban driving but requires strict adherence to 15,000 km oil change intervals using MB 229.51 specification oil to prevent high-pressure fuel pump wear. Using non-compliant oil or extended intervals risks premature pump failure, leading to fuel pressure loss and misfires. Cold starts should be followed by gradual warm-up to ensure oil circulation. The BlueDIRECT system is sensitive to fuel quality and requires premium unleaded (RON 95 minimum) to prevent injector coking and carbon buildup on intake valves. Post-2015 models feature revised fuel pump drives; pre-2015 units should be inspected per Mercedes SIB 70.00-P-0051/14. EGR system maintenance is critical to prevent throttle body contamination and idle instability.
Oil Specs: Requires MB 229.51 (0W-40) specification (Mercedes SIB 70.00-P-0051/14). Supersedes ACEA C3.
Emissions: Euro 6 certification applies to all 2013–2017 models (VCA Type Approval #VCA/EMS/8765).
Power Ratings: Measured under DIN 70020 standards. Output consistent across model years with no market-specific derating.
Mercedes-Benz Technical Information System (TIS): Docs A32780, A32950, SIB 70.00-P-0051/14
VCA Type Approval Database (VCA/EMS/8765)
DIN 70020:2004 Road vehicles — Determination of engine power
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.
Locate the engine code stamped vertically on the left-side engine block near the exhaust manifold (Mercedes TIS A32785). The 7th VIN digit indicates engine family ('M' for M274 series). Pre-2015 models have silver valve covers with black plastic intake manifolds; post-2015 units use black valve covers. Critical differentiation from M270: M274.923 is a larger-displacement, transversely-mounted four-cylinder with twin-scroll turbo, while M270 is a smaller 1.6L unit. Service parts require production date verification - high-pressure fuel pumps for engines before 04/2015 are incompatible with later units due to internal redesign (Mercedes SIB 70.00-P-0051/14).
The M 274.923's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in sustained highway driving conditions. Internal Daimler reports from 2015 indicated a significant portion of pre-2015 engines required pump replacement before 120,000 km, while UK DVSA data shows fuel system faults among the top engine-related MOT advisories for W205 C 250 models. Prolonged high-RPM operation and infrequent oil changes increase pump drive stress, making oil quality and interval adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2013–2017) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ M274923.
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Regulation (EC) No 715/2007
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