Abstract: The present invention is an engine oil cleaner comprising the oil cleaner body, a corrugated porous paper board (or non-corrugated porous paper board), a polar plate, a filter cartridge, an electric conduction spring plate, several insulating rubber items and a high voltage electrostatic generator, wherein its feature lies in that the high voltage electrostatic generator is used to produce a electrostatic field between the casing body of the engine oil cleaner body and the polar plate and in this electrostatic field fully fills up the engine oil cleaner body, thus making the very small metal particles inducted and hereby possess electric charges which then are absorbed on the surface of the corrugated porous paper board, and the filter cartridge is used to filter out the smaller metal particles twice and also to eliminate the moisture and the catalysts such as the extraneous matters in the engine oil, thus preventing the engine oil from becoming deteriorated as well as extending the life of the engine oil so