The Mercedes — Benz M139.930 is a 1,991 cc, inline — four, turbocharged petrol engine produced between 2019 and 2023. It features a 16 — valve, DOHC configuration with direct fuel injection and twin — scroll turbocharging. This high — output engine delivers exceptional specific output, making it one of the most powerful production four — cylinder engines in the world.
Fitted to the C63 AMG (W205), CLA45 AMG (C118), and A45 AMG (W177) models, the M139.930 was engineered for hi…
All production years 2019–2023 meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/5682).
The Mercedes-Benz M139.930 is a 1,991 cc inline-four turbocharged petrol engine engineered for high-performance applications (2019–2023). It combines direct fuel injection with a twin-scroll turbocharger and motorsport-derived architecture to deliver extreme power density. Designed to meet Euro 6d standards, it represents the pinnacle of Mercedes-AMG's four-cylinder engine development.
| 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 | 285 kW (387 PS) @ 6,500 rpm | |
Torque | 480 Nm @ 5,000–5,800 rpm | |
Fuel system | Direct injection (Bosch HDEV6, 350 bar) | |
Emissions standard | Euro 6d | |
Compression ratio | 9.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single twin-scroll turbo (ball-bearing, BorgWarner) | |
Timing system | Double-row roller chain (rear-mounted) | |
Oil type | 0W-40 (MB 229.52) | |
Dry weight | 161 kg |
The Mercedes-Benz M139.930 was used across Mercedes-Benz's W177/C118/W205 platforms with transverse mounting in hot-V configuration. This engine received platform-specific tuning-adapted throttle response in the W205 and revised cooling layouts in the W177-and from 2021, updated piston cooling jets and turbocharger housings per AMG TB 07.0124, creating service part interchange limits. All adaptations are documented in OEM technical bulletins.
The M139.930's primary reliability risk is turbocharger thermal stress on early builds, with elevated incidence in track use. Internal AMG quality reports from 2020 indicated a notable portion of pre-2021 engines required turbo inspection before 120,000 km, while VCA data shows a share of emissions failures linked to lambda sensor drift from heat soak. Sustained high speeds and aggressive driving increase bearing and seal stress, making oil quality and adherence to MB 229.52 specification critical.
Analysis derived from Mercedes-AMG technical bulletins (2019-2023) and UK DVSA failure statistics (2020-2024). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The M139.930 delivers exceptional performance but early models (2019-2020) are prone to turbocharger thermal stress. Later revisions (post-2021) with upgraded components significantly improve durability. Regular maintenance, strict use of 0W-40 MB 229.52 oil, and proper cooldown procedures after hard driving are essential for long-term reliability.
Key issues include turbocharger bearing wear (especially pre-2021), coolant leaks from the intercooler, ignition coil failures under high load, and oil consumption from piston ring wear. These are documented in Mercedes-AMG technical bulletins and are manageable with preventative maintenance and proper driving habits.
This 2.0L turbocharged four-cylinder was used in high-performance AMG models: the W177 A-Class (A 45 S AMG), C118 CLA-Class (CLA 45 S AMG), and W205 C-Class (C 63 S AMG) from 2019 to 2023. It replaced the M133 engine and represents the most powerful series-production four-cylinder in Mercedes-AMG history.
Yes, the M139.930 has significant tuning potential. ECU remapping can safely achieve 450–500 PS with supporting modifications (intercooler, exhaust). The forged internals and robust block allow for high boost levels, but over-tuning without proper cooling and fueling can lead to detonation and engine damage.
Fuel consumption is high due to performance tuning. In an A 45 S AMG, expect ~12.0 L/100km (city) and ~8.0 L/100km (highway), or approximately 24–30 mpg UK. Real-world figures depend heavily on driving style, but this engine prioritizes performance over economy.
Yes. The M139 series is an interference engine. If the timing chain fails or jumps, pistons can collide with open valves, resulting in catastrophic internal damage. Regular inspection of the chain and tensioner is crucial to prevent expensive repairs.
Mercedes specifies 0W-40 oil meeting MB 229.52 specification. This high-performance synthetic oil is essential for maintaining oil pressure and protecting turbocharger bearings and piston components under high-RPM operation. Oil changes should be performed every 15,000 km or annually to ensure optimal lubrication and longevity.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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