The Mercedes-Benz M 273.970 is a 5,461 cc, V8 naturally aspirated petrol engine produced between 2005 and 2011. It features dual overhead camshafts (DOHC), variable valve timing (VVT) on intake and exhaust, and direct fuel injection (CGI). Delivering between 225 kW (306 PS) and 285 kW (388 PS), it provided refined performance across Mercedes’ luxury and performance segments.
Fitted to models including the W221 S-Class, W211 E-Class, and R230 SL-Class, the M 273.970 was engineered for smooth, linear power delivery and long-distance cruising comfort. Emissions compliance was achieved through a closed-loop three-way catalyst system and precise lambda control, enabling Euro 4 compliance for all units, with select 2008–2011 builds meeting early Euro 5 thresholds in specific markets.
One documented concern is premature camshaft sprocket wear, particularly in early production engines (2005–2007). Highlighted in Mercedes-Benz Technical Service Bulletin 02 0501 08, this issue stems from insufficient surface hardening of the sprocket teeth. A revised, hardened sprocket was introduced in 2008, reducing failure incidence significantly.
Production years 2005–2007 meet Euro 4 standards; 2008–2011 models may have Euro 5 compliance depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Mercedes-Benz M 273.970 is a 5,461 cc V8 naturally aspirated engine engineered for luxury sedans and coupes (2005–2011). It combines CGI direct injection with dual variable valve timing to deliver refined power and responsive throttle characteristics. Designed to meet Euro 4 (and select Euro 5) emissions standards, it balances high-end performance with improved fuel efficiency over its predecessor.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 5,461 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | 90° V8, DOHC, 32-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 98.0 mm × 90.5 mm | |
| Power output | 225–285 kW (306–388 PS) | |
| Torque | 460–530 Nm @ 2,700–4,000 rpm | |
| Fuel system | CGI direct injection (up to 120 bar) | |
| Emissions standard | Euro 4 (all); Euro 5 (select markets, 2008–2011) | |
| Compression ratio | 10.7:1 | |
| Cooling system | Water-cooled, dual-circuit | |
| Turbocharger | Not applicable | |
| Timing system | Dual chain (primary and secondary), tensioner-equipped | |
| Oil type | MB 229.5 (SAE 5W-40) | |
| Dry weight | 202 kg |
The M 273.970 delivers smooth, linear power ideal for grand touring but requires strict adherence to 15,000 km oil change intervals using MB 229.5 specification oil to prevent camshaft sprocket and timing chain wear. MB 229.5 (5W-40) oil is critical due to its high-shear stability and additive package protecting the CGI high-pressure pump and chain tensioners. Extended idling or short trips can accelerate carbon buildup in the intake tract due to reduced airflow. The CGI system demands high-octane fuel (98 RON recommended) to prevent pre-ignition under load. Post-2008 models feature hardened cam sprockets; pre-2008 units should be inspected per SIB 02 0501 08. Lambda sensor health is essential for maintaining emissions compliance and fuel trim accuracy.
Oil Specs: Requires MB 229.5 (5W-40) specification (Mercedes-Benz SIB 02 0501 08). Supersedes ACEA A3/B4.
Emissions: Euro 4 certification applies to all models (2005–2011) (VCA Type Approval #VCA/EMS/5678). Select 2008–2011 units meet Euro 5 based on market-specific calibrations.
Power Ratings: Measured under DIN 70020 standards. 285 kW output requires premium fuel (98 RON) and correct ECU calibration (Mercedes-Benz TIS Doc. A35601).
Mercedes-Benz Technical Information System (TIS): Docs A35172, A35601, SIB 02 0501 08
VCA Type Approval Database (VCA/EMS/5678)
DIN Deutsches Institut für Normung: DIN 70020 Engine Power Testing
The Mercedes-Benz M 273.970 was used across Mercedes-Benz's W211/W221/R230 platforms with longitudinal mounting. This engine received platform-specific adaptations-intake manifold tuning in the E-Class and revised cooling in the S-Class-and from 2009 the W221 S-Class facelift introduced updated ECU calibrations, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front right-side cylinder bank near the timing cover (Mercedes-Benz TIS A35172). The 8th VIN digit indicates engine family ('E' for M273 series). Pre-2008 models have silver cam covers with 'CGI' branding; post-2008 units retain black cam covers. Critical differentiation from M272: M273.970 is a V8 with dual chain drive, while M272 is a V6 with single chain. Service parts require production date verification - cam sprockets for engines before 08/2008 are incompatible with later hardened units (Mercedes-Benz SIB 02 0501 08).
The M 273.970's primary reliability risk is camshaft sprocket wear on early builds, with elevated incidence in mixed urban/highway use. Internal Mercedes-Benz quality reports from 2009 indicated a notable share of pre-2008 engines requiring sprocket replacement before 150,000 km, while UK DVSA records show increased catalyst failures linked to fuel trim errors from cam timing drift. Short trips and delayed oil changes increase wear on the timing chain and tensioner, making oil quality and interval adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2005-2012) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ M273970.
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Regulation (EC) No 715/2007
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