Abstract: A system for fryer oil usage has at least one fryer having a vat and a valved drain, a first oil storage container having an oil delivery line connected with the vat, a second oil storage container connected with the valved drain and vat of the fryer, both containers having an inert gas blanket in a vapor space thereof, a first filter connected with the valve of the drain of the fryer, a pump connected with the first filter and the second oil storage container and in valved communication with the vat, a polishing line connected with the pump and with the first filter, and a three-way valve movable to a first position for blocking the flow of oil, a second position for allowing the flow of oil to the second oil storage container, and a third position for allowing the flow of oil to the vat of the fryer.