The Mercedes — Benz M 177.984 is a 3,982 cc, V8 petrol engine produced between 2017 and 2023. It features a twin — turbocharged DOHC 32 — valve configuration with direct fuel injection (CGI), dry sump lubrication, and high — pressure fuel system (up to 2,000 bar), delivering 450 kW (612 PS) and 850 Nm of torque. This high — performance engine was engineered for AMG GT, E — Class, and S — Class applications requiring maximum power and track capability.
Fitted to the AMG GT (C190), E 6…
All production years (2017–2023) meet Euro 6b emissions standards .
The Mercedes-Benz M 177.984 is a 3,982 cc twin-turbocharged V8 petrol engine designed for high-performance AMG models (2017–2023). It combines hot-V turbocharging with direct injection and dry sump lubrication to deliver track-focused performance and driver engagement. Designed to meet Euro 6b emissions standards, it balances extreme power output with everyday drivability in performance-oriented applications.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,982 cc | |
Fuel type | Petrol | |
Configuration | V8, DOHC, 32-valve | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 83.0 mm × 92.0 mm | |
Power output | 450 kW (612 PS) @ 5,500–6,500 rpm | |
Torque | 850 Nm @ 2,500–4,500 rpm | |
Fuel system | Direct fuel injection (CGI), up to 2,000 bar | |
Emissions standard | Euro 6b | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Twin-scroll turbochargers in 'hot-V' configuration | |
Timing system | Double-row roller chain (front-mounted) | |
Oil type | 10W-60 MB-Approval 229.5 | |
Dry weight | 187 kg |
The Mercedes-Benz M 177.984 was used across Mercedes-Benz's C190/W213/C217 platforms with transverse (C190) and longitudinal (W213/C217) mounting and no licensed external applications. This engine received platform-specific adaptations-tuned intake manifolds in the C190 and reinforced engine mounts in the W213-and from 2020 the facelifted W213 received updated ECU mapping, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The M 177.984 offers high-revving, twin-turbocharged performance but early models (2017–2019) had reliability concerns, particularly high-pressure fuel pump drive wear. Later revisions (post-2019) improved durability with reinforced components and revised inspection intervals. Well-maintained examples with regular servicing and correct oil (10W-60 MB-Approval 229.5) can be robust. Cold-start procedures and adherence to oil change intervals are critical for longevity.
The primary issues are high-pressure fuel pump drive lobe wear (especially pre-2019), ignition coil degradation, oil leaks from valve and front covers, and intake manifold actuator failure. These are well-documented in Mercedes-Benz service bulletins. Secondary concerns include fuel injector coking and catalytic converter blockage due to high fuel consumption and infrequent highway driving.
This 4.0L V8 was used in the AMG GT (C190) from 2017–2023, the E 63 S (W213) from 2017–2023, and the S 63 (C217) from 2018–2020. It was not licensed to other manufacturers. All applications were Euro 6b compliant, with no Euro 6c version produced.
Aftermarket ECU tuning is common on the M177984 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel consumption is very high due to performance tuning. In an E 63 S (W213), typical use is ~18.5 L/100km (city) and ~10.2 L/100km (highway), or about 15 mpg UK combined. Real-world figures often range between 12–16 mpg (UK) depending on driving style. Highway cruising is more efficient than urban use due to the engine's low-RPM torque characteristics.
Yes. The M 177.984 is an interference engine. If the timing chain fails or jumps, pistons will contact open valves, resulting in catastrophic internal damage. Chain maintenance and proper lubrication are essential—any unusual front-end noise should be investigated immediately to prevent engine seizure.
Mercedes-Benz specifies 10W-60 oil meeting MB-Approval 229.5. Use only high-quality synthetic oils designed for high-load petrol engines. Change intervals should not exceed 15,000 km or annually. Proper oil selection ensures adequate fuel pump drive lubrication and reduces wear in the timing chain system.
Comprehensive technical documentation and regulatory references
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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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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