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 high-revving performance, rapid throttle response, and motorsport-derived dynamics. Emissions compliance was achieved through dual catalytic converters and closed-loop lambda control, allowing Euro 6d compliance across its production run.
One documented performance enhancement is the use of forged internals and advanced cooling systems to sustain high-RPM operation. This design, detailed in Mercedes-Benz AMG Technical Bulletin 07.0124, includes an integrated water-cooled intercooler and dry-sump lubrication to maintain oil pressure under track conditions. Later builds (post-2021) received revised piston cooling jets and upgraded turbocharger housings for improved thermal management.
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 high-revving turbocharged inline-4 provides explosive power delivery ideal for performance driving but requires strict adherence to 15,000 km oil change intervals using MB 229.52-specified 0W-40 oil to maintain turbo and bearing integrity. High-RPM operation demands consistent oil pressure; dry-sump system failure can lead to catastrophic engine damage. The HDEV6 fuel system is robust but sensitive to fuel quality. Post-2021 engines benefit from upgraded piston cooling jets and turbo housings per AMG Technical Bulletin 07.0124. Catalytic converters require premium unleaded fuel meeting EN 228 to prevent thermal degradation and backpressure issues.
Oil Specs: Requires MB 229.52 specification (Mercedes AMG TB 07.0124). 0W-40 viscosity critical for high-temperature turbo and bearing protection.
Emissions: Euro 6d certification applies to all 2019–2023 models (VCA Type Approval #VCA/EMS/5682). No market-specific variants.
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Mercedes Group PT-2019).
Mercedes-Benz Technical Information System (TIS): Docs A33763, A34025, AMG TB 07.0124
VCA Type Approval Database (VCA/EMS/5682)
DIN Deutsches Institut für Normung: DIN 70020 Power Measurement Standard
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.
Locate the engine code stamped vertically on the right-side engine block near the oil filter housing (Mercedes TIS A33813). The 8th VIN digit indicates engine type ('M' for M139 series). All units have black cam covers with red AMG lettering. Critical differentiation from M133: M139.930 has a hot-V turbo layout with integrated intercooler, while M133 uses side-mounted turbo. Service parts require production date verification - turbochargers before 08/2021 are incompatible with later units due to housing and bearing upgrades (Mercedes AMG TB 07.0124).
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.
Find answers to most commonly asked questions about MERCEDES-BENZ M139930.
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Regulation (EC) No 715/2007
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