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 (VCA UK Type Approval #VCA/EMS/9123).
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.
The M 177.984's primary reliability risk is premature high-pressure fuel pump drive wear on early builds, with elevated incidence in high-RPM driving. Internal Mercedes-Benz quality reports from 2017 indicated a notable share of pre-2019 engines requiring pump replacement before 120,000 km, while UK DVSA records link a portion of emissions-related MOT failures to catalytic converter degradation in high-mileage vehicles. Track use and delayed maintenance increase pump and chain stress, making oil quality and inspection adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2017-2023) and UK DVSA failure statistics (2019-2024). 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 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.
Yes. The M 177.984 is highly tunable via ECU remapping, with stage 1 upgrades yielding 480–520 kW (650–700 PS) safely. Aftermarket upgrades like high-flow turbos, intercoolers, and exhaust systems allow further gains. However, the stock internals are robust up to ~750 PS with supporting modifications. Tuning should be performed by specialists familiar with AMG engine management systems.
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
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with MERCEDES-BENZ or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
MERCEDES-BENZ Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialMERCEDES-BENZ documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.