Contaminants can enter your gearbox oil via vents or the fill tube during examining/filling. Most of the time, having said that, contaminants are the result of ordinary use. The gearbox filter shields towards these contaminants which will help strengthen gearbox lifestyle. These are likely to use out with time. On https://collinwjrxg.bloggazza.com/33110362/the-ultimate-guide-to-filter-gearbox