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A method for preserving cooking oil in situ in the fryer comprises contacting the oil, during at least one period during which frying operations are not on¬ going, with an oil-permeable cementious material which has been hydraulically hardened from a paste comprising : (a) > 50 wt% of (i) white OPC clinker, (ii) white OPC or (iii) a mixture of white OPC clinker and white OPC, and (b) optionally further ingredients selected from silica, titania, lime, calcium sulphate, hydrated alumina, natural feldspars, diatomaceous earth, Na and Ca forms of natural and synthetic zeolites, clays, pillared clays, activated clays/earths, silicate minerals selected from calcium silicate, magnesium silicate, aluminium silicate, agalmatolite, amphiboles, attapulgite, granite porphyry, kaolinite, porphyry, rhyolite, talc and wollastonite. The porosity of the cementious material is between 30-55%. The oil-permeable cementious material is removed from the fryer during frying operations.