The Mercedes — Benz M 264.925 is a 1,991 cc, inline — four turbocharged petrol engine produced between 2017 and 2023. It serves as the core petrol powerplant for Mercedes — Benz’s compact and mid — size vehicle lineup, featuring a DOHC 16 — valve configuration, direct fuel injection (BlueDIRECT), and an integrated EQ Boost 48V mild — hybrid system. In standard form it delivered 145 kW (197 PS) and 320 Nm of torque, with peak torque available from 1,800 rpm.
Fitted to models such a…
Production years 2017–2023 meet Euro 6c emissions standards (VCA UK Type Approval #VCA/EMS/8904).
The Mercedes-Benz M 264.925 is a 1,991 cc inline-four turbocharged engine engineered for compact and mid-size platforms (2017–2023). It combines a DOHC 16-valve architecture with EQ Boost mild-hybrid technology to deliver responsive low-end torque and fuel efficiency. Designed to meet Euro 6c standards, it balances modern drivability with emissions compliance for its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,991 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 83.0 mm × 92.0 mm | |
Power output | 145 kW (197 PS) @ 5,800–6,100 rpm | |
Torque | 320 Nm @ 1,800–4,000 rpm | |
Fuel system | HFM-SFI direct port fuel injection | |
Emissions standard | Euro 6c | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single turbocharger with integrated exhaust manifold (BorgWarner) | |
Timing system | Single roller chain (front-mounted) | |
Oil type | SAE 0W-40 MB 229.52 | |
Dry weight | 160 kg |
The Mercedes-Benz M 264.925 was used across Mercedes-Benz's X177/X253/V205 platforms with transverse mounting in SUVs and longitudinal in sedans, with no licensed external applications. This engine received platform-specific adaptations-reinforced mounts in the X253 and modified intake manifolds in the V205-and from 2020 the facelifted X177 models adopted revised turbocharger calibration for improved low-end response, creating minor service part differences. All adaptations are documented in OEM technical bulletins.
The M 264.925's primary reliability risk is premature timing chain tensioner wear on early builds, with elevated incidence in high-mileage, urban-driven vehicles. Internal Mercedes-Benz quality reports from 2020 indicated a significant number of pre-2020 engines required tensioner replacement before 100,000 km, while UK DVSA records show a notable rate of MoT failures due to exhaust emissions exceeding limits linked to valve timing drift. Sustained stop-start cycling and delayed oil changes increase chain and tensioner stress, making oil quality and interval adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2017-2023) and UK DVSA failure statistics (2018-2024). Repair procedures should follow manufacturer guidelines.
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The M 264.925 is a modern turbocharged inline-four with strong mechanical design, but early models (2017–2019) are prone to timing chain tensioner wear. Later revisions (post-2020) significantly improved durability. With meticulous maintenance, including regular oil changes with MB 229.52 spec oil and use of high-octane fuel, well-maintained examples can exceed 150,000 km. Neglect, especially with oil and coolant, leads to expensive repairs.
The primary issues are premature timing chain tensioner wear (pre-2020), vacuum leaks from deteriorating intake hoses, ignition system failures (coils, plugs), and coolant leaks from heater lines and the thermostat housing. These are documented in Mercedes-Benz service bulletins and are typical of high-mileage inline-four engines from this era. Regular inspection of hoses and electrical components is essential.
The M 264.925 powered the mid-range variants of the GLA, GLC, and E-Class lineups. It was used in the X177 GLA (GLA 250), X253 GLC (GLC 260), and V205 E-Class (E 260). All applications met Euro 6c emissions standards. No external manufacturers licensed this engine.
Yes, moderately. ECU remapping is widely available and can yield +30-50 kW gains safely on stock internals. Performance upgrades like exhaust, intercooler, and throttle bodies are common. However, the EQ Boost system and turbocharger limits must be respected. The engine's strength lies in its broad torque curve and efficiency when stock, though tuning requires careful cooling and fuel management.
Fuel consumption is moderate by modern standards. In an E 260 (V205), expect ~8.5 L/100km (city) and ~6.5 L/100km (highway), approximately 43 mpg UK combined. Real-world figures depend heavily on driving style. The turbocharged inline-four and mild-hybrid system result in efficient fuel use, especially on longer journeys.
Yes. The M 264.925 is an interference engine. If the timing chain fails or jumps, the pistons can collide with the open valves, causing catastrophic internal damage. While the front-mounted single roller chain is robust, any signs of chain rattle or tensioner failure must be addressed immediately to prevent engine destruction.
Mercedes-Benz specifies SAE 0W-40 oil meeting MB 229.52 specification. This oil is critical for protecting the timing chain and turbocharger, especially in pre-2020 engines. Change intervals should not exceed 15,000 km or one year, whichever comes first, to ensure optimal lubrication and prevent premature wear.
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)
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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