The Mercedes — Benz M 157.983 is a 5,980 cc, twin — turbocharged V8 petrol engine produced between 2012 and 2017. It powered high — performance AMG models including the S 63 AMG, CL 63 AMG, and SL 63 AMG, delivering 430 kW (585 PS) and 900 Nm of torque. Featuring a 90° V8 configuration, DOHC 32 — valve layout, and direct fuel injection, it combined forced induction with AMG's signature high — revving character.
Fitted exclusively to flagship AMG performance vehicles, the M 157.98…
All production years 2012–2017 meet Euro 5 standards .
The Mercedes-Benz M 157.983 is a 5,980 cc 90° V8 twin-turbocharged petrol engine developed for high-performance AMG applications (2012–2017). It combines dual overhead camshafts and 32-valve architecture with direct fuel injection to deliver aggressive power delivery and motorsport-inspired responsiveness. Designed to meet Euro 5 emissions standards, it represents the peak of Mercedes-AMG's twin-turbo V8 engineering before downsizing trends.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,980 cc | |
Fuel type | Petrol | |
Configuration | 90° V8, DOHC, 32-valve | |
Aspiration | Twin-turbocharged (hot-V layout) | |
Bore × stroke | 102.2 mm × 92.6 mm | |
Power output | 430 kW (585 PS) @ 5,500 rpm | |
Torque | 900 Nm @ 2,250–3,750 rpm | |
Fuel system | Direct fuel injection (up to 200 bar) | |
Emissions standard | Euro 5 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Twin-scroll turbochargers (BorgWarner, hot-V configuration) | |
Timing system | Double-row roller chain (front-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 218 kg |
The Mercedes-Benz M 157.983 was used across Mercedes-Benz's W221/C217/R231 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-reinforced engine mounts in the W221 and revised intake manifolds in the R231-and from 2015 the facelifted W222 adopted the M177 twin-turbo V8, 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 157.983 offers exceptional performance and robust construction, but early models (2012–2014) are prone to high-pressure fuel pump wear. Later revisions (post-2015) improved durability with updated materials and cooling. When maintained properly—especially with timely oil changes using 5W-40 MB 229.5 oil—these engines can exceed 200,000 km. Regular inspection of intake manifolds and ignition components is advised.
The most documented issues are HPFP wear (causing hard starting), intake manifold vacuum leaks, ignition coil failures, and coolant leaks from thermostat housing. These are confirmed in Mercedes-Benz service bulletins. Carbon buildup on intake valves is common due to direct injection. Emissions components like catalytic converters are prone to degradation in short-trip usage.
This 6.0L twin-turbo V8 was used exclusively in AMG performance models: the W221 S 63 AMG (2012–2013), C217 CL 63 AMG (2012–2014), R231 SL 63 AMG (2012–2016), and C218 CLS 63 AMG (2013–2017). It was not used in any smaller platforms or licensed to other manufacturers. All applications featured rear-wheel drive with 7G-TRONIC PLUS automatic transmission.
Yes, the M 157.983 is highly tunable. ECU remapping can yield +60–100 kW by optimizing boost, fuel, and ignition maps. Aftermarket upgrades like larger turbos, intercoolers, and exhausts can push output beyond 600 kW. However, stock internals are stressed at high power levels. Reliability decreases significantly above 550 kW without forged internals and enhanced cooling.
Fuel consumption is high for a performance V8. In an S 63 AMG, typical usage is ~16.0 L/100km (city) and ~9.5 L/100km (highway), or approximately 17.6 mpg UK combined. Real-world figures depend heavily on driving style, but expect 14–17 mpg (UK) under mixed conditions. The engine requires premium unleaded (RON 98) for optimal performance and knock prevention.
Yes. The M 157 series is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. The front-mounted double-row chain is robust but tensioner wear can occur. Any unusual front-end noise should be investigated immediately to prevent catastrophic failure.
Mercedes-Benz specifies 5W-40 oil meeting MB 229.5 standard. This high-performance synthetic ensures proper turbo bearing and HPFP protection under load. Oil must be changed every 15,000 km or annually to prevent sludge and component wear. Using incorrect viscosity or non-compliant oil can accelerate HPFP failure and void historical warranty claims.
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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