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Corn oil is oil extracted from the germ of corn ( maize) . Its main use is in cooking, where its high smoke point makes refined corn oil a valuable frying oil. It is also a key ingredient in some margarines.Corn oil is generally less expensive than most other types of vegetable oils.[ citation needed] One bushel of corn contains 1.55 pounds of corn oil ( 2.8% by weight) .Corn agronomists have developed high-oil varieties; however, these varieties tend to show lower field yields, so they are not universally accepted by growers.