Remove the plug 3 from the oil separator tank filling port.Draining the cooling oil from the separator tank:The oil separator tank can be drained from a point accessible through a hole in the floor panel.Place the oil receptacle below the corresponding drain hole in the floor pan.Unscrew the drain plug 2 and allow the cooling oil to drain into the receptacle.Fit a new gasket on the drain plug and screw it back in.Draining the oil from the oil cooler