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By-pass filtration of engine lubricating oils is now a widely used technique for controlling the cleanliness of the oil during a vehicles service interval. The two common by-pass filtration techniques used by the automotive industry being barrier media filtration and self-driven centrifugal oil cleaners. In general it can be said that the fundamental operating principles of a centrifugal oil cleaner are poorly understood by others. The aim of this paper is to raise the general level of understanding of centrifugal oil cleaners and to aid lubrication system designers in the comparison of these devices with other filtration techniques. This paper initially discusses the reasoning behind by-pass oil filtration and then goes on to assess some of the fundamental operating parameters which need to be addressed when fitting a self-driven by-pass centrifugal oil cleaner.