Jabsco Oil Change Pump The Jabsco Oil Change Pump is designed to be installed near a vesselÆs engine and permanently plumbed to the engineÆs oil pan. The pump can be used to remove old oil from the engine, then with the integral reversing switch, the flow direction can be changed to pump a measured amount of new oil back into the engine. The connection to the engine should be controlled by the 3/8ö ball valve(provided) to guard against accidental oil discharge