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 (VCA UK Type Approval #VCA/EMS/5682).
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 | MB 229.5 (SAE 5W-40) | |
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.
The M272.978's primary reliability risk is timing chain tensioner failure, with elevated incidence in high-mileage vehicles and those with extended oil intervals. Internal Mercedes-Benz quality reports from 2010 indicated over 16% of pre-2009 units required chain or tensioner service before 120,000 km, while UK DVSA records show a notable share of emissions-related MOT failures linked to cam timing faults. Extended oil intervals and poor fuel quality increase chain and guide stress, making oil quality and service adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2007-2016) and UK DVSA failure statistics (2014-2022). 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 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.
Yes, the M272.978 is tunable via ECU remapping. Stage 1 tunes typically yield +30-40 kW safely, as the naturally aspirated design and internals can handle moderate increases. However, gains beyond this require upgraded intake, exhaust, and engine management. Tuning should only be performed after addressing known reliability items like the tensioner and oil system.
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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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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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
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