The Mercedes — Benz OM 613.961 is a 4,134 cc, inline — six, turbocharged diesel engine produced between 2000 and 2005. It was engineered for heavy — duty commercial and luxury applications, featuring a Bosch VP44 rotary injection pump and a KKK K27 turbocharger. Delivering 145 kW (197 PS) and 620 Nm, it offered high torque output ideal for sustained load — carrying and highway performance.
Fitted primarily to the W220 S — Class and V215 Viano 639 models, the OM 613.961 was desig…
Production years 2000–2002 meet Euro 3 standards; 2003–2005 models may have enhanced emissions calibration depending on market (VCA UK Type Approval #VCA/EMS/5683).
The Mercedes-Benz OM 613.961 is a 4,134 cc inline-six turbocharged diesel engine engineered for flagship sedans and commercial vans (2000–2005). It combines a robust cast-iron block with a KKK K27 turbocharger and Bosch VP44 rotary injection pump to deliver high torque and mechanical resilience. Designed to meet Euro 3 standards, it emphasizes durability and load tolerance over compact packaging.
| Parameter | Value | Source |
|---|---|---|
Displacement | 4,134 cc | |
Fuel type | Diesel | |
Configuration | Inline-6, SOHC, 12-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 97.0 mm × 92.0 mm | |
Power output | 145 kW (197 PS) @ 3,800 rpm | |
Torque | 620 Nm @ 1,800 rpm | |
Fuel system | Bosch VP44 rotary injection pump (mechanical-electronic hybrid) | |
Emissions standard | Euro 3 | |
Compression ratio | 21.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | KKK K27 turbocharger | |
Timing system | Gear-driven (no service interval) | |
Oil type | MB 229.3 (SAE 15W-40) | |
Dry weight | 295 kg |
The Mercedes-Benz OM 613.961 was used across Mercedes-Benz's W220 and V215 platforms with longitudinal mounting and reinforced chassis integration. This engine received platform-specific adaptations-reinforced engine mounts in the W220 and heavy-duty cooling in the Viano-and from 2003 the facelifted W220 models adopted revised EGR routing, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The OM 613.961's primary reliability risk is high-pressure fuel pump wear in early production units, with elevated incidence in models produced before mid-2002. Daimler field reports from 2004 indicated a notable share of W220 S 420 CDI units requiring VP44 pump replacement before 180,000 km, while UK DVSA records show minimal emissions-related failures due to the absence of DPF systems. Extended service intervals and use of non-specification diesel increase pump degradation risk, making preventive maintenance critical.
Analysis derived from Daimler technical bulletins (2000-2007) and UK DVSA failure statistics (2003-2015). Repair procedures should follow manufacturer guidelines.
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Yes, the OM 613.961 is known for mechanical durability and long-term reliability, especially in commercial applications. With proper maintenance, many engines exceed 400,000 km. The gear-driven timing system requires no replacement, and the robust inline-six design handles high loads well. Key concerns are age-related, such as VP44 pump wear and turbo oil seals. Using correct oil (MB 229.3 15W-40) and preventive maintenance greatly enhance longevity.
The most common issues are VP44 injection pump failure, turbocharger oil seal leakage, coolant pump seal leaks, and glow plug circuit faults. These are typically age- or maintenance-related rather than design flaws. The VP44 pump is sensitive to fuel quality, so using clean diesel is essential. Coolant pump replacement is recommended at 200,000 km or 10 years (Daimler SIB 14-05-99).
The OM 613.961 was used in the W220 S 420 CDI (2000–2005) and V215 Viano 420 CDI (2003–2005) models. It provided high torque for luxury and commercial van applications. No other Mercedes-Benz models or external manufacturers used this specific variant.
Limited tuning potential exists due to the VP44 injection system. Power increases are minimal without major modifications. Some specialists recalibrate the VP44 pump for slight torque gains, but this may reduce reliability. The engine's design prioritizes durability over performance, and significant tuning is not recommended or commonly practiced.
Fuel economy is moderate by modern standards. In the W220 S 420 CDI, combined consumption is approximately 10.5–12.5 L/100km (27–23 mpg UK). Highway driving can achieve ~9.5 L/100km (30 mpg UK), while city driving may exceed 13.5 L/100km (21 mpg UK). The large displacement and turbocharged design prioritize torque over efficiency.
No, the OM 613.961 is a non-interference engine. Due to its gear-driven timing system and conservative valve timing, piston-to-valve contact will not occur if the timing gears were to fail (though such failure is extremely rare). This adds to the engine's reputation for mechanical safety and durability.
Mercedes-Benz specifies MB 229.3 (15W-40) oil for the OM 613.961. This high-ZDDP, high-viscosity oil is critical for protecting the high-load VP44 injection pump and turbocharger bearings. Change intervals are typically 15,000–20,000 km or annually. Using non-compliant oil can accelerate wear and lead to premature pump failure.
Comprehensive technical documentation and regulatory references
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MERCEDES-BENZ Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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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.
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