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Oil filters are relatively simple devices which are based on the principals of membranes. The most common material for which oil filters are made is cellulose. Cellulose as the membrane traps particulates in the engine oil resulting in the opposite side (ideally) with a decreased concentration of contaminants. Filters are rated based on the sizes of the particulates they capture, in addition to their holding capacity.

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Q: How does an oil filter work?
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As the filter does it's work it becomes more and more clogged with filtered out particles. Eventually it will cease to work as a filter and the oil will just bypass the filter completely. Eventually you will no longer be filtering the oil. Replace the filter at every oil change.


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