I see a lot of herbicides mixes here calling for crop oil presumably as a surfactant. I can't find that anywhere at home. All I see is 80/20 non-ionic surfactant. Are we talking about the same thing (I know they aren't the exact same thing)? Or at least similar enough products to be interchangeable? If not, what other effects are achieved by the use of crop oil as opposed to a generic surfactant?