A centrifugal oil filter is a type of filtration device used to remove contaminants from engine or industrial oil using centrifugal force instead of a traditional filter element. It is commonly used in diesel engines, generators, and heavy machinery to improve oil cleanliness and extend engine life. The main components include a rotor (spinning chamber), housing, oil inlet and outlet, nozzles or jets, and a mounting base.

In operation, pressurized oil from the engine enters the filter and flows into the rotor. Inside the rotor, the oil is forced through small nozzles, causing the rotor to spin at very high speed. As the rotor spins, centrifugal force pushes heavier contaminants such as dirt, metal particles, and sludge outward to the inner walls of the rotor. These impurities stick to the walls and form a layer of deposits, while the cleaned oil flows back into the engine system. Periodically, the rotor is opened and the accumulated sludge is removed manually. Centrifugal oil filters are valued for their high efficiency, low maintenance cost (no replaceable filter elements), and ability to remove very fine particles from oil.