Contaminants can enter your gearbox oil by way of vents or perhaps the fill tube during examining/filling. Usually, on the other hand, contaminants are the results of standard wear. The gearbox filter safeguards against these contaminants which will help strengthen gearbox life. Old automated transmissions usually have steel mesh filters. https://filtergearbox93452.blogdosaga.com/33992658/not-known-facts-about-filter-gearbox