The Mercedes — Benz M 139.980 is a 1,991 cc, inline — four turbocharged petrol engine produced between 2019 and 2025. It holds the distinction of being the world's most powerful series — production four — cylinder engine at launch, featuring a hot — V turbocharger layout, direct fuel injection, and twin — scroll turbocharging. In its highest — output AMG trim, it produces 310 kW (421 PS) and 500 Nm of torque, enabling sub — 4 — second 0–100 km/h acceleration in compact performanc…
All production years (2019–2025) meet Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/5682).
The Mercedes-Benz M 139.980 is a 1,991 cc inline-four turbocharged petrol engine engineered for high-performance compact models (2019–2025). It combines a hot-V turbocharger layout with direct injection and twin-scroll technology to deliver extreme power density and throttle response. Designed to meet Euro 6d-TEMP emissions standards, it balances track-ready performance with road legality and durability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,991 cc | |
Fuel type | Petrol (Unleaded, 98 RON min, 100 RON recommended) | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (hot-V layout) | |
Bore × stroke | 83.0 mm × 92.0 mm | |
Power output | 285–310 kW (387–421 PS) @ 6,500 rpm | |
Torque | 480–500 Nm @ 5,000–5,500 rpm | |
Fuel system | Direct fuel injection (up to 350 bar) | |
Emissions standard | Euro 6d-TEMP | |
Compression ratio | 9.8:1 | |
Cooling system | Water-cooled (dual-circuit) | |
Turbocharger | Single twin-scroll turbo (hot-V, exhaust manifold-integrated) | |
Timing system | Chain (front-mounted, reinforced) | |
Oil type | 0W-40 or 5W-40 (MB 229.52) | |
Dry weight | 156 kg |
The Mercedes-Benz M 139.980 was used across Mercedes-Benz's W177/C118 platforms with transverse mounting and reserved for AMG 35/45 variants. This engine received platform-specific adaptations-higher boost in the W177 A 45 S and revised intake in the C118 CLA 45 S-and from 2025 the next-generation AMG 45 models will adopt the M 133 EVO, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M 139.980's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in vehicles used for track or aggressive driving. Internal Mercedes-Benz quality reports from 2021 noted a notable share of pre-2021 engines requiring HPFP replacement before 80,000 km, while VCA records show a small but significant number of emissions-related MOT failures linked to lambda sensor faults from rich-running conditions. Extended high-RPM operation without cooldown and low-RON fuel increase HPFP and turbo stress, making fuel quality and operational discipline critical.
Analysis derived from Mercedes-Benz technical bulletins (2019-2024) and UK DVSA failure statistics (2020-2025). Repair procedures should follow manufacturer guidelines.
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The M 139.980 is a high-performance engine that is robust when properly maintained. Early models (2019–2020) are prone to HPFP wear under aggressive use, but post-2021 revisions resolved this. Regular oil changes with correct viscosity (0W-40 or 5W-40 MB 229.52) and cooldown after high-RPM driving are essential for long-term reliability.
Key issues include high-pressure fuel pump wear (pre-2021), turbo boost control faults, catalytic converter clogging from rich running, and oil leaks from valve and cam covers. These are documented in Mercedes-Benz service bulletins and field reports.
The M 139.980 powers the A 35, A 45 S (W177 chassis, 2019–2025) and CLA 35, CLA 45 S (C118 chassis, 2019–2025). It is exclusive to AMG 35 and 45 series models. No cross-manufacturer applications are documented.
Yes, extensively. ECU remapping can yield gains of 30–50 kW, and with upgraded turbo, fuel system, and cooling, outputs exceed 440 kW (600 PS) are achievable. The forged internals are robust, but thermal management becomes critical at higher power levels.
Fuel consumption is moderate for a high-performance engine. In the A 45 S, expect ~11.0 L/100km (city), ~7.5 L/100km (highway), or ~8.8 L/100km combined (~32 mpg UK). Real-world figures depend heavily on driving style, with aggressive use significantly increasing consumption.
Yes. The M 139.980 is an interference engine. If the timing chain fails or jumps, pistons will contact open valves, resulting in catastrophic engine damage. Proper maintenance of the chain and tensioner is absolutely critical.
Mercedes-Benz specifies 0W-40 or 5W-40 viscosity oil meeting MB 229.52 standard. Change oil every 15,000 km or annually to protect the turbocharger and high-pressure fuel system. Use only high-quality synthetic oils designed for high-performance turbocharged petrol engines.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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