The Mercedes — Benz OM606.912 is a 3,199 cc, inline — six, turbocharged diesel engine produced between 1998 and 2002. It features indirect injection via a pre — chamber system and a SOHC valvetrain with mechanical valve clearance adjustment. Delivering 110 kW (150 PS) at 4,200 rpm and 350 Nm of torque at 1,800 rpm, it was engineered for commercial and fleet applications requiring durability and strong low — end pulling power.
Fitted to the W210 E — Class (E240 D) and select Vito…
Production years 1998–2002 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/5681).
The Mercedes-Benz OM606.912 is a 3,199 cc inline-six diesel engine engineered for commercial and fleet applications (1998–2002). It combines indirect injection with a robust SOHC valvetrain to deliver reliable, low-maintenance performance. Designed to meet Euro 2 standards, it prioritizes durability over high output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,199 cc | |
Fuel type | Diesel | |
Configuration | Inline-6, SOHC, 12-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 97.0 mm × 108.0 mm | |
Power output | 110 kW (150 PS) @ 4,200 rpm | |
Torque | 350 Nm @ 1,800 rpm | |
Fuel system | Bosch inline injection pump, indirect injection (pre-chamber) | |
Emissions standard | Euro 2 | |
Compression ratio | 21.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | KKK K27 turbocharger | |
Timing system | Chain-driven camshaft (single-row), manual valve adjustment | |
Oil type | SAE 10W-40, ACEA B2/B3 | |
Dry weight | 225 kg |
The Mercedes-Benz OM606.912 was used across Mercedes-Benz's W210 and W639 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-reinforced mounts in the W639 and revised oil pan in the W210-and from 2000 the facelifted W210 models adopted improved oil return lines to address turbo lubrication issues, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
The OM606.912's primary reliability risk is turbocharger bearing wear, with elevated incidence in vehicles used under sustained load or with poor lubrication maintenance. Internal Mercedes-Benz field reports from 2000 noted a significant number of pre-2000 units requiring turbo replacement before 200,000 km, while VCA MOT data links extended oil intervals to early turbo failures. Infrequent oil changes and infrequent coolant replacements increase thermal and mechanical stress, making scheduled maintenance critical.
Analysis derived from Mercedes-Benz technical bulletins (1998-2002) and UK DVSA failure statistics (1999-2005). Repair procedures should follow manufacturer guidelines.
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The OM606.912 is fundamentally robust and capable of exceeding 400,000 km with diligent maintenance. However, pre-2000 models are prone to turbocharger bearing wear under sustained load. Later units with revised oil return lines are more durable. Regular oil and coolant changes, using correct 10W-40 oil, and avoiding sustained high loads are essential for longevity.
The most documented issues are turbocharger bearing wear (especially pre-2000), camshaft/follower wear due to poor lubrication, injection pump timing drift, and cooling system failures. These are confirmed in Mercedes-Benz service bulletins and long-term owner reports. Preventative maintenance significantly reduces failure rates.
The OM606.912 was used in the W210 E-Class (E240 D) and W639 Vito (114 D, 115 D) from 1998 to 2002. It was not used in other model lines or licensed to other manufacturers. All applications meet Euro 2 emissions standards.
No meaningful tuning potential exists. The engine is turbocharged with a mechanical inline pump and no ECU. Output is fixed at 150 PS. Modifications are impractical and compromise reliability. The design prioritizes durability and economy over performance.
Fuel economy is modest by modern standards. In a W210 E240 D, expect 8.5–9.5 L/100km (33–29 mpg UK) in mixed driving. Highway efficiency improves to ~7.5 L/100km (37 mpg UK). Real-world consumption depends heavily on vehicle condition and driving style.
Yes. The OM606.912 is an interference engine. If the timing chain fails or skips, piston-to-valve contact will occur, resulting in severe internal damage. Regular inspection of the chain and tensioner is critical, especially on high-mileage engines.
Mercedes-Benz specifies SAE 10W-40 oil meeting ACEA B2/B3 standards (compatible with MB 229.1). Change intervals should not exceed 30,000 km or 2 years. Proper oil is vital for turbocharger, main bearings, and piston cooling, especially given the high compression ratio and mechanical valve train.
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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).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
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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