What might a consistent reading of 15-20 Kpa indicate about an oil filter?

A consistent reading of 15-20 Kpa suggests that the oil filter is functioning properly. In a well-maintained filtration system, this pressure differential indicates that the filter is effectively allowing the oil to flow through it while still retaining contaminants and debris. This level of pressure drop is typical for a clean oil filter under operational conditions.

When a filter is in good condition, it should not exhibit an excessively high pressure drop, which could signify blockage or excessive contamination. Thus, the indication of 15-20 Kpa reflects that the filter is still performing its intended role without being overly restricted.

In contrast, a new filter would typically show even lower pressure differentials, as it has not had time to accumulate debris. A contaminated filter would exhibit a higher pressure reading, indicating a need for cleaning or replacement. Similarly, a filter that needs replacement would also show significantly elevated pressure readings due to blockage from accumulated impurities. Therefore, the reading of 15-20 Kpa aligns best with proper function and indicates that the filter is adequately handling the flow of oil without excessive resistance.