Oil contamination may be defined as any foreign material found in the lubricant which is not added by design. Usually, contaminants are not beneficial, and may be detrimental, to the performance of the oil and/or the operating machinery. Contamination is a significant root cause of machine and lubricant degradation and failure. Often overlooked as a source of failure because its impact is usually slow and imperceptible, contamination is both a significant threat to reliability and quality efforts, and an opportunity because improvements are very attainable1. Research on an array of fluid dependent machinery such as bearings and rotating equipment, hydraulic systems, gearboxes, and diesel engines, clearly supports that often machine reliability is a function of contamination control.

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