Abrasive put on is an additional worry, normally brought on by particulate issue suspended from the oil. This is often why Used Oil Evaluation for put on metals and contaminants is essential to monitor gearbox health. Will have to not be Employed in cars which has a damp clutch/friction drives: https://gearboxoiltreatment09642.answerblogs.com/34362656/fascination-about-gearbox-oil-treatment