The Mercedes — Benz M272.978 is a 5,461 cc, V8 petrol engine produced between 2006 and 2015. It features a naturally aspirated design with multi — point fuel injection and double overhead camshafts (DOHC) per bank. In standard tune it delivers 285 kW (388 PS) and 530 Nm of torque, primarily used in luxury and performance — oriented vehicles.
Fitted to models such as the W221 S — Class, R230 SL — Class, and C219 CLS — Class, the M272.978 was engineered for smooth, effortless power d…
All production years (2006–2015) meet Euro 4 emissions standards .
The Mercedes-Benz M272.978 is a 5,461 cc V8 naturally aspirated petrol engine engineered for luxury applications (2006-2015). It combines variable valve timing (VVT) on both intake and exhaust camshafts with sequential multi-point injection to deliver linear power delivery and strong low-to-mid-range torque. Designed to meet Euro 4 emissions standards, it balances refinement with responsive performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,461 cc | |
Fuel type | Petrol | |
Configuration | 90° V8, DOHC, 32-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 97.0 mm × 92.0 mm | |
Power output | 285 kW (388 PS) @ 6,000 rpm | |
Torque | 530 Nm @ 2,800–4,800 rpm | |
Fuel system | Sequential multi-point fuel injection (ME 9.7 control system) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing chain (dual-row, front-mounted, tensioner-prone) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 210 kg |
The Mercedes-Benz M272.978 was used across Mercedes-Benz's W221/R230 platforms with longitudinal mounting. This engine received platform-specific adaptations-revised exhaust manifolds in the R230 and modified intake routing in the C219-and from 2009 the facelifted W221 models adopted updated engine management and tensioner hardware, 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 M272.978 offers smooth V8 power delivery and strong torque, but early models (2006-2008) had reliability concerns, particularly with the timing chain tensioner. Later revisions (post-2009) improved component durability, so well-maintained examples can be robust. Regular servicing and using high-quality oil (5W-40 MB 229.5) greatly enhance longevity.
The most documented issues are timing chain tensioner wear, intake carbon buildup, coolant leaks from plastic housings, and ignition coil failures. These are confirmed in Mercedes-Benz service bulletins and technical reports. Tensioner and chain issues are most prevalent in poorly maintained or high-mileage vehicles.
This 5.5L V8 petrol engine was used in the W221 S-Class (S550), R230 SL-Class (SL 550), C219 CLS-Class (CLS 550), and C215 CL-Class (CL 550). Applications span 2006-2015 with full Euro 4 compliance. It was specifically tuned for longitudinal mounting in luxury and grand tourer platforms.
Aftermarket ECU tuning is common on the M272978 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.
Moderate to high. In a W221 S550 (2008), combined consumption is approximately 13.5 L/100km (21 mpg UK). City driving may see 16–19 L/100km, while highway runs can achieve 10.0–11.5 L/100km. Real-world economy depends heavily on driving style, as the large V8 consumes more at idle and under load.
Yes. The M272 series is an interference engine. If the timing chain fails or jumps, pistons can collide with open valves, resulting in severe internal damage. Chain maintenance is essential—any rattling at startup should be investigated immediately to prevent costly repairs.
Mercedes-Benz specifies SAE 5W-40 oil meeting MB 229.5 specification. This synthetic oil is critical for protecting the timing chain system and valve train. Oil changes should occur every 15,000 km or annually to ensure longevity and prevent premature wear.
Comprehensive technical documentation and regulatory references
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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.
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