The Mercedes — Benz OM611.962 is a 2,148 cc, inline — four, naturally aspirated 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 55 kW (75 PS) at 4,200 rpm and 150 Nm of torque at 2,200 rpm, it was engineered for economical urban operation and light commercial use. The compact design enables transverse mounting in front — wheel — drive platforms…
Production years 1998–2002 meet Euro 2 standards .
The Mercedes-Benz OM611.962 is a 2,148 cc inline-four diesel engine engineered for compact and commercial 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 economy over output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,148 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, SOHC, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 90.0 mm | |
Power output | 55 kW (75 PS) @ 4,200 rpm | |
Torque | 150 Nm @ 2,200 rpm | |
Fuel system | Bosch inline injection pump, indirect injection (pre-chamber) | |
Emissions standard | Euro 2 | |
Compression ratio | 22.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven camshaft (single-row), manual valve adjustment | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 170 kg |
The Mercedes-Benz OM611.962 was used across Mercedes-Benz's W168 and W638 platforms with transverse mounting and no licensed external applications. This engine received platform-specific adaptations-shorter accessory drive in the W168 and reinforced mounts in the W638-and from 2000 the revised cylinder head casting reduced cracking risk, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
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The OM611.962's primary reliability risk is cylinder head cracking, with elevated incidence in vehicles used under sustained load or with poor cooling maintenance. Internal Mercedes-Benz field reports from 2000 noted a significant number of pre-2000 units requiring head replacement before 200,000 km, while VCA MOT data links cooling system neglect to early head failures. Extended oil intervals and infrequent coolant changes increase thermal stress, making scheduled maintenance critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 OM611.962 is fundamentally robust and capable of exceeding 250,000 km with diligent maintenance. However, pre-2000 models are prone to cylinder head cracking under thermal stress. Later units with revised heads 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 cylinder head cracking (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 OM611.962 was used in the W168 A-Class (A170 D) and W638 Vito (110 D, 111 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 naturally aspirated with a mechanical inline pump and no ECU. Output is fixed at 75 PS. Modifications are impractical and compromise reliability. The design prioritizes durability and economy over performance.
Fuel economy is modest by modern standards. In a W168 A170 D, expect 6.6–7.3 L/100km (43–38 mpg UK) in mixed driving. Highway efficiency improves to ~6.1 L/100km (46 mpg UK). Real-world consumption depends heavily on vehicle condition and driving style.
Yes. The OM611.962 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 camshaft, chain, and piston cooling, especially given the high compression ratio and mechanical valve train.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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