Unscrew the oil plug with an external hexagon wrench to release dirty oil, then select the appropriate vacuum pump oil according to the pumping speed model and the ambient temperature used by the pump, then unscrew the oil inlet directly above the pump and pour the oil in, first a little. After the oil level reaches MIN, you can start the pump again, rotate it for a few minutes, then stop the machine, and then clean the oil again, if possible, this time clean the spilled oil.
By the way, SV-U46 or SV-T46 is the pump model below VRD-30.
If the pumping speed is equal to VRD-30, select 68. Unless your place is extremely cold and the temperature in the studio is below zero, you should also use 46 instead.