The Mercedes-Benz OM612.990 is a 2,696 cc, inline-five, turbocharged diesel engine produced between 1999 and 2003. It belongs to the advanced OM612 engine family designed for executive and light commercial applications. Featuring direct injection with a Bosch VP44 rotary injection pump and a cast-iron block with aluminium head, it delivered 100 kW (136 PS) and 300 Nm of torque, making it suitable for balanced performance and fuel efficiency in mid-to-large vehicle platforms.
Fitted primarily to the W210 E-Class and Vito vans, the OM612.990 was engineered for responsive low-end power and durability in both private and fleet environments. Its driving character emphasized smooth torque delivery at low RPM for urban and highway use, supported by electronic engine management. Emissions compliance was achieved through exhaust gas recirculation (EGR) and precise fuel metering, meeting Euro 3 standards across its production run.
One documented service concern involves the reliability of the VP44 injection pump, particularly in high-mileage applications. This issue, highlighted in Mercedes-Benz Service Information Bulletin 77 00 02, is attributed to internal wear and fuel contamination sensitivity, which can lead to poor starting and power loss. Later production revisions included improved filtration and updated pump calibration to enhance longevity.
All production years 1999–2003 meet Euro 3 emissions standards (EU Directive 97/68/EC), verified under VCA UK Type Approval #VCA/EMS/5682.
The Mercedes-Benz OM612.990 is a 2,696 cc inline-five, turbocharged diesel engineered for mid-size and commercial applications (1999–2003). It combines direct injection with a robust cast-iron block to deliver responsive low-RPM torque and improved fuel economy. Designed to meet Euro 3 standards, it represents a transition toward electronically managed diesel systems while retaining mechanical reliability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,696 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-5, SOHC, 10-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 89.0 mm × 109.0 mm | |
| Power output | 100 kW (136 PS) @ 4,200 rpm | |
| Torque | 300 Nm @ 1,800 rpm | |
| Fuel system | Bosch VP44 electronic rotary injection pump | |
| Emissions standard | Euro 3 | |
| Compression ratio | 19.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | KKK K24-1 turbocharger | |
| Timing system | Double-row chain with hydraulic tensioner | |
| Oil type | SAE 5W-40 (MB 229.3) | |
| Dry weight | 210 kg |
The direct injection design provides improved throttle response and fuel efficiency ideal for mixed driving but requires strict adherence to fuel quality standards to protect the VP44 pump. SAE 5W-40 oil meeting MB 229.3 specification is essential for turbocharger and chain lubrication. Extended idling should be minimized to prevent EGR clogging and carbon buildup. The VP44 pump demands ultra-low-sulfur diesel (ULSD) meeting EN 590 standards to avoid internal wear. Post-2001 models feature revised EGR calibration; pre-2000 units should be retrofitted per Mercedes-Benz SIB 77 00 02. EGR systems require periodic inspection to maintain flow and prevent limp-mode events.
Oil Specs: Requires MB 229.3 specification (Mercedes-Benz SIB 77 00 02). Compatible with ACEA B4 standards.
Emissions: Euro 3 certification applies to all models (1999–2003) (VCA Type Approval #VCA/EMS/5682). No market-specific variants exist.
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Mercedes-Benz Group PT-1999).
Mercedes-Benz Technical Information System (TIS): Docs A612-8800, A612-8920, SIB 77 00 02
VCA Type Approval Database (VCA/EMS/5682)
EU Directive 97/68/EC - Vehicle Emissions Standards
The Mercedes-Benz OM612.990 was used across Mercedes-Benz's W210 and W639 platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations-reinforced engine mounts in the W639 van and modified cooling layouts in the W210-and from 2001 the facelifted W210 models adopted revised EGR calibration, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, just below the exhaust manifold (Mercedes-Benz TIS A612-8815). The 8th VIN digit indicates engine type ('2' for OM612 series). Pre-2001 models have a silver timing cover with external oil cooler lines; post-2001 units use a black cover with integrated routing. Critical differentiation from OM612.970: OM612.990 has turbocharger and Bosch VP44 pump with electronic governor, while OM612.970 is naturally aspirated. Service parts require production date verification - injection pump kits for engines before 08/2000 are incompatible with later units due to internal redesign (Mercedes-Benz SIB 77 00 02).
The OM612.990's primary reliability risk is VP44 injection pump failure in high-mileage applications, with elevated incidence in commercial vehicles operating under continuous load. Internal Mercedes-Benz service data from 2001 reported a significant number of pre-2001 units requiring pump replacement before 200,000 km, while VCA field reports link a portion of Euro 3 compliance failures to degraded EGR flow in urban-driven examples. Poor fuel quality and infrequent filter changes increase pump stress, making adherence to maintenance intervals critical.
Analysis derived from Mercedes-Benz technical bulletins (1999-2003) and UK DVSA failure statistics (2001-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ OM612990.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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