Contaminants can enter your gearbox oil via vents or perhaps the fill tube during examining/filling. Most of the time, nevertheless, contaminants are the result of typical use. The gearbox filter guards towards these contaminants which can help increase gearbox everyday living. That is why manufacturers came up with inner filters. https://filtergearbox58567.bloggactivo.com/33368790/considerations-to-know-about-filter-gearbox