GMC, differential oil change in Zevulun

GMC, differential oil change in Zevulun.
It is recommended to change the differential oil each 60 thousand operational kilometers. In the process of changing the oil, the plug is removed to pour oil into the reduction gear, it is checked whether the oil reaches the lower edge of the hole. If not, then the drain plug is unscrewed, the used oil is drained into the prepared container, the drain plug is cleaned at the same time. It is required to install the drain plug and pour the fresh oil.