The life of the filter is based on the need to filter thedegree of contamination of the oil and the frequency of use of the customer toset the oil filter. If the customer oil is not dirty, less frequent use, suchas once a month. Then the filter''s life is long. If the oil is dirty, every dayusing the oil filter, then the filter life is relatively shorter. Relativelyspeaking, stainless steel filter than polymer made of high-fiber filter in thesame case life longer.