An automotive oil filter comprising a water absorbing and releasing body for engine oil, the water absorbing and releasing body comprising: 0.01 % by mass to 20% by mass of a water-soluble organic macromolecule in 100% by mass of the water absorbing and releasing body; 0.01% by mass to 20% by mass of a silicate in 100% by mass of the water absorbing and releasing body; 0.001% by mass to 20% by mass of a dispersant for the silicate in 100% by mass of the water absorbing and releasing body; and at least a solvent selected from the group consisting of water and a water-soluble organic solvent, wherein the content of the solvent in the water absorbing and releasing body is from 50% by mass to 99% by mass; wherein when the water-soluble organic solvent is present, its content is 0.5% by mass to 10% by mass in 100% by mass of the water absorbing and releasing body; wherein the water-soluble organic macromolecule is a fully neutralized polyacrylate, in which all the carboxylate structures form salt structures, or partially neutralized polyacrylate, in which the carboxylic acid structures and the carboxylate salt structures, exist in a mixed state, having a weight average molecular weight of 1,000,000 to 10,000,000, measured by gel permeation chromatography in terms of polyethyleneglycol; wherein the degree of neutralization of the partially neutralized polyacrylate is 10% to 90%; the silicate is at least one of water-swellable silicate particles selected from the group consisting of smectite, bentonite, vermiculite, and mica; and the dispersant is at least one substance selected from the group consisting of a fully neutralized salt or partially neutralized salt of orthophosphoric acid, a fully neutralized salt or partially neutralized salt of pyrophosphoric acid, a fully neutralized salt or partially neutralized salt of tripolyphosphoric acid, a fully neutralized salt or partially neutralized salt of tetraphosphoric acid, a fully neutralized salt or partially neutralized salt of hexametaphosphoric acid, a fully neutralized salt or partially neutralized salt of polyphosphoric acid, a fully neutralized salt or partially neutralized salt of etidronic acid, sodium poly(meth)acrylate, ammonium poly(meth)acrylate, a sodium acrylate/sodium maleate copolymer, an ammonium acrylate/ammonium maleate copolymer, sodium hydroxide, hydroxylamine, sodium carbonate, sodium silicate, polyethylene glycol, polypropylene glycol, sodium humate, and sodium ligninsulfonate. 0.01 % by mass to 20% by mass of a water-soluble organic macromolecule in 100% by mass of the water absorbing and releasing body; 0.01% by mass to 20% by mass of a silicate in 100% by mass of the water absorbing and releasing body; 0.001% by mass to 20% by mass of a dispersant for the silicate in 100% by mass of the water absorbing and releasing body; and at least a solvent selected from the group consisting of water and a water-soluble organic solvent, wherein the content of the solvent in the water absorbing and releasing body is from 50% by mass to 99% by mass; wherein when the water-soluble organic solvent is present, its content is 0.5% by mass to 10% by mass in 100% by mass of the water absorbing and releasing body; wherein the water-soluble organic macromolecule is a fully neutralized polyacrylate, in which all the carboxylate structures form salt structures, or partially neutralized polyacrylate, in which the carboxylic acid structures and the carboxylate salt structures, exist in a mixed state, having a weight average molecular weight of 1,000,000 to 10,000,000, measured by gel permeation chromatography in terms of polyethyleneglycol; wherein the degree of neutralization of the partially neutralized polyacrylate is 10% to 90%; the silicate is at least one of water-swellable silicate particles selected from the group consisting of smectite, bentonite, vermiculite, and mica; and the dispersant is at least one substance selected from the group consisting of a fully neutralized salt or partially neutralized salt of orthophosphoric acid, a fully neutralized salt or partially neutralized salt of pyrophosphoric acid, a fully neutralized salt or partially neutralized salt of tripolyphosphoric acid, a fully neutralized salt or partially neutralized salt of tetraphosphoric acid, a fully neutralized salt or partially neutralized salt of hexametaphosphoric acid, a fully neutralized salt or partially neutralized salt of polyphosphoric acid, a fully neutralized salt or partially neutralized salt of etidronic acid, sodium poly(meth)acrylate, ammonium poly(meth)acrylate, a sodium acrylate/sodium maleate copolymer, an ammonium acrylate/ammonium maleate copolymer, sodium hydroxide, hydroxylamine, sodium carbonate, sodium silicate, polyethylene glycol, polypropylene glycol, sodium humate, and sodium ligninsulfonate.