Abrasive don is yet another issue, normally a result of particulate make any difference suspended within the oil. This is certainly why Made use of Oil Examination for wear metals and contaminants is important to watch gearbox wellness. Ought to not be used in cars having a moist clutch/friction drives: https://gearbox-oil-treatment40583.activablog.com/33281608/about-gearbox-oil-treatment