ENGINE lubricating oil filtration is not an exact science. Despite recent advances, detailed understanding of how filters and filtration systems operate is sparse, yet filters are known to facilitate dramatic reductions in engine wear. This paper relates the size of contaminants found in used oil to the magnitudes of the oil films between the lubricated components, in order to define the required filtration level in engines. The results of wear tests with oil contaminated by small particles are used to confirm the filtration requirement.
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