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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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