The Mercedes — Benz M 260.921 is a 1,991 cc, inline — four turbocharged petrol engine produced between 2017 and 2023, serving as the mid — range powerplant for the C — Class (W205), E — Class (W213), and GLC (X253) lineups. It features a 16 — valve DOHC configuration with multi — point fuel injection and twin — scroll turbocharging, delivering 190 kW (258 PS) and 370 Nm of torque. This transversely mounted engine was engineered for responsive performance and strong low — end drive…
All production years (2017–2023) meet Euro 6c emissions standards (VCA UK Type Approval #VCA/EMS/4567).
The Mercedes-Benz M 260.921 is a 1,991 cc inline-four turbocharged petrol engine engineered for compact and mid-size platforms (2017–2023). It combines twin-scroll turbocharging with transverse mounting to deliver responsive performance. Designed to meet Euro 6c standards, it balances everyday drivability with adequate power for highway use.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,991 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (twin-scroll) | |
Bore × stroke | 83.0 mm × 92.0 mm | |
Power output | 190 kW (258 PS) @ 5,500–6,100 rpm | |
Torque | 370 Nm @ 1,300–4,000 rpm | |
Fuel system | Multi-point fuel injection (MPI) | |
Emissions standard | Euro 6c | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single twin-scroll turbo (journal bearing, water-cooled) | |
Timing system | Timing chain (single-row) | |
Oil type | 5W-30 (MB-Approval 229.51) | |
Dry weight | 147 kg |
The Mercedes-Benz M 260.921 was used across Mercedes-Benz's W205/W213/X253 platforms with transverse mounting and developed for mid-size applications. This engine received platform-specific adaptations-reinforced mounts in the W213 and enhanced cooling in the X253-and from 2020 the updated W205 received a redesigned oil pump for improved lubrication, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M 260.921's primary reliability risk is timing chain wear on early builds, with elevated incidence in vehicles with extended oil intervals. Internal Mercedes-Benz quality reports from 2021 indicated a notable portion of pre-2020 engines required chain replacement before 120,000 km, while UK DVSA MOT records show increased emissions failures linked to degraded valve timing in high-mileage units. Infrequent oil changes and use of incorrect viscosity increase wear rates, 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 260.921 delivers adequate performance but early models (2017-2019) are prone to timing chain wear if oil changes are delayed. Later units (2020-2023) with revised oil pumps show improved durability when maintained properly. Regular servicing with MB-Approval 229.51 oil and adherence to 15,000 km intervals are essential for long-term reliability, especially in warm climates.
Key issues include timing chain stretch due to inadequate lubrication, turbocharger oil coking, coolant leaks from the plastic water pump, and ignition coil degradation. These are documented in Mercedes-Benz service bulletins. Valve cover gasket leaks and EGR clogging are also reported in high-mileage examples.
The M 260.921 was factory-installed in the W205 C 300 (2017–2023), W213 E 300 (2017–2023), and X253 GLC 300 (2018–2023). It was not used in any other production Mercedes-Benz model. This mid-range petrol engine was reserved for premium compact and mid-size models in European and Asian markets.
Yes. The M 260.921 has moderate tuning potential. ECU remapping can yield gains of 30–50 kW by optimizing boost and ignition maps. More significant increases require upgraded turbos, intercoolers, and fuel systems. Many owners achieve 350–400 PS with stage 2 modifications, though this increases stress on stock internals and cooling systems.
Fuel consumption is moderate for its class. In the C 300, typical usage is ~8.5 L/100km (city) and ~6.2 L/100km (highway), or approximately 45.0 mpg UK combined. Real-world figures depend heavily on driving style, but expect 40–45 mpg (UK) under mixed conditions for a well-maintained unit.
Yes. The M 260.921 is an interference engine. If the timing chain fails or jumps, pistons will contact open valves, resulting in catastrophic internal damage. The single-row chain system requires inspection at major services. Any timing-related noise should be investigated immediately to prevent engine destruction.
Mercedes-Benz specifies 5W-30 mineral or semi-synthetic oil meeting MB-Approval 229.51 standards. Change intervals should not exceed 15,000 km. Using non-approved oils can lead to timing chain and lifter wear. OEM-recommended brands include Mobil 1 FS 5W-30 and Castrol Edge 5W-30 for long-term protection.
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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