Abstract: Treatment and recovery of used frying oils uses combinations of adsorbents and antioxidants which provide unexpected improvements in used frying oil adsorptive and other properties, quality and service life such that the recovered frying oil can be reused. Used frying oil can be treated with a ternary mixture of adsorbents comprising calcium silicate, magnesium silicate and at least one of a porous rhyolitic material and silicon dioxide in effective amounts to unexpectedly and significantly reduce free fatty acids of the treated used frying oil as well as improve total polar component, oil stability and color thereof. Combinations of antioxidants can be included in the treated oil in effective amounts to provide unexpected, significant improvements in oil stability and service life of the treated used frying oil.