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It appears that SOMETIMES you can substitute soybean or vegetable oil concentrates(?) according to this
URL.
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Good info! Best read the label carefully and then check with your wife before you run off with her vegetable oil
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Oil concentrates: (Also crop oil concentrates). These are normally a mixture of non-phytotoxic oil and 10 to 20 percent surfactant. For herbicides that suggest an "oil concentrate," you can sometimes substitute soybean or vegetable oil concentrates for crop oil concentrates. However, some herbicide labels do not recommend the use of soybean oil. Consult the herbicide label before using a soybean oil
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JNRBRONC reminded me...crop oil will mix evenly in the sprayer tank but vegetable oil will seperate most likely do to emulsifiers
Emulsifier
A surfactant that promotes the suspension of one immiscible liquid in another.
Surfactant or Surface Agent
A material that when added to a liquid agent medium, modifies the properties of the medium at a surface or interface. This is a general term that includes soluble detergents in liquid medium, dispersing agents, emulsifying agents, foaming agents, penetrating agents and wetting agents.