Are optical particle counters capable of accurately measuring new oil cleanliness when Si & Ca additives are used in the oil?
We have been filtering new oil in an effort to insure it is clean. We have set a target cleanliness level of ISO 16/13. However we are having trouble meeting this level when measured with an optical particle counter. Microscopic analysis shows the oil as being clean but also shows round spheres under high magnification that are thought to be oil additives for detergent and antifoam.
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