Original MANN-FILTER Oil Filter W 940/4 – For Trucks, Buses and Utility Vehicles

Product Overview

The MANN‑FILTER Oil Filter W 940/4 is a high‑performance filtration solution engineered for heavy‑duty trucks, buses and utility vehicles. Designed to meet the rigorous demands of commercial fleets, this filter delivers superior protection for engine oil systems while maintaining optimal flow characteristics.

Key Design Features

• Anti‑Return Valve: A built‑in one‑way valve prevents backflow and protects the engine from contaminated return lines.
• Thread Specification: 3/4‑16 UNF‑2B, a standard size that ensures compatibility with most heavy‑duty oil filter housings.
• Robust Construction: The housing is made from high‑strength polypropylene reinforced with a steel insert for added durability under vibration and temperature extremes.
• High‑Capacity Filter Media: A multi‑layer cartridge composed of synthetic fibers and activated carbon provides exceptional particulate capture while minimizing pressure drop.
• Extended Service Life: Engineered to retain filtration efficiency up to 30,000 km (or the manufacturer’s recommended interval), reducing maintenance frequency for fleet operators.

Performance Characteristics

The W 940/4 delivers a balance of low pressure drop and high flow rate, ensuring that engine oil remains clean without compromising lubrication performance. Typical specifications include:

• Pressure Drop (at 100 L/min): < 0.5 bar
• Maximum Flow Rate: >120 L/min at standard operating temperatures.
• Operating Temperature Range: –40 °C to +200 °C, suitable for both cold‑start and high‑temperature conditions.
• Particle Retention: 99.9% removal of particles ≥5 µm.

Compatibility Matrix

The filter is specifically tailored for a wide range of commercial vehicle engines, including but not limited to:

• Ford Power Stroke V8 diesel engines (e.g., 6.7L, 7.3L)
• Mercedes-Benz OM 471/474 series
• Volvo D13/D16 engines
• Scania DC-series engines
• MAN D Series and D26 engines
• Various heavy‑duty gasoline engines used in buses and utility vehicles.

Installation Guidance

1. Preparation: Ensure the engine is cool and the oil filter housing is clean. Remove any debris that may have accumulated during previous maintenance.
2. Threading: Hand‑tighten the new filter onto the housing, then use a torque wrench to achieve 12–15 Nm (adjust according to specific vehicle specifications).
3. Check for Leaks: After installation, start the engine and inspect for oil leaks around the filter seal.
4. Flush System: If the filter is being replaced after a long period of inactivity, flush the system with fresh oil before operating to remove any residual contaminants.

Maintenance Tips

• Replace the filter at the manufacturer’s recommended interval or sooner if oil contamination is detected.
• Inspect the anti‑return valve for signs of wear; replace if leakage occurs.
• Avoid using incompatible thread sizes or adapters that could compromise seal integrity.
• Store unused filters in a dry, temperature‑controlled environment to preserve media performance.

Benefits for Fleet Operators

• Reduced Downtime: Longer service intervals mean fewer stops for maintenance.
• Engine Longevity: Consistent oil cleanliness protects bearings, pistons and camshafts from wear.
• Cost Efficiency: Lower pressure drop translates to reduced fuel consumption and improved engine efficiency.
• Reliability in Harsh Conditions: Designed for extreme temperatures and vibration, ensuring dependable operation on long hauls or off‑road duties.

Technical Specifications Summary

Conclusion

The MANN‑FILTER Oil Filter W 940/4 stands out as a reliable, high‑quality component for commercial vehicle fleets. Its combination of robust construction, advanced filtration media, and thoughtful design features—such as the anti‑return valve and standardized threading—ensures that engines receive clean oil under all operating conditions. By choosing this filter, fleet managers can achieve greater engine protection, lower maintenance costs, and improved operational efficiency.