Engine hnathawh lai hian metal bawlhhlawh, leivut, carbon deposit te chu temperature sang takah oxidized, colloidal sediment leh tui te chu lubricating oil ah an lut chhunzawm zel a. Oil filter hnathawh chu heng mechanical impurities leh colloidal substance te hi paih chhuakin, lubricating oil chu a thianghlim reng a, a service life pawh a ti rei thei a ni. Oil filter hian filtration capacity chak tak, flow resistance hniam tak, leh service life rei tak a nei tur a ni. Lubrication system pangngaiah chuan filtration theihna hrang hrang nei filter engemaw zat-filter, coarse filter, leh fine filter-main oil gallery-a parallel emaw series-a inzawm emaw a khawlkhawm thin. (Main oil gallery nena series-a inzawm filter te chu full-flow filter an ti a, engine hnathawh laiin lubricating oil zawng zawng a kal tlang vek a; parallel-a inzawm filter te chu split-flow filter an ti a.) Coarse filter chu main oil gallery nena series-a inzawm chu full-flow filter a ni a main oil gallery nena parallel-a inzawm filter tha tak chu split-flow filter a ni. Tunlai passenger car engine hian a tlangpuiin collector filter leh full-flow oil filter pakhat chauh an nei thin. Coarse filter hian engine oil-a particle size 0.05mm aia tam bawlhhlawh a paih chhuak a, fine filter hmang hian bawlhhlawh 0.001mm aia tam particle size nei te chu paih chhuah a ni thung.
