Contaminants can enter your gearbox oil as a result of vents or maybe the fill tube through checking/filling. More often than not, however, contaminants are the result of standard don. The gearbox filter protects from these contaminants which allows enhance gearbox life. Aged automated transmissions frequently have metal mesh filters. https://filtergearbox23333.bloggactif.com/35374112/top-filter-gearbox-secrets