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You can substitute vegetable oil, cup for cup, for shortening. Using oil versus shortening will change the texture of baked goods. The shortening, being a solid fat, will add more air to the batter when beaten in, giving the end product more of a cakey structure rather than the more dense structure oil will give. Ultimate Baking Secrets Revealed.
I should have said. :-) â staticsan Mar 20 '12 at 5:34. Note that you can't necessarily do a one-to-one substitution of butter for oil: Oil is 100% fat while butter has a lot of water content, which will affect many baked goods. Shortening is 100% fat, though, so that's fine to use as a substitute.