In a large mixing bowl, whisk together the flour, sugar, and salt.
In a separate bowl (or glass measuring cup), whisk together the oil and milk.
Add the oil mixture to the dry ingredients, and stir together with a fork until the flour is all moistened.
Press the dough evenly in an un-greased pie plate, covering the bottom and sides. If you're making a fruit cobbler, save back about a third of the mixture to crumble on top of the cobbler.
If you want to crimp the edges, go right ahead.
Bake at 350° F for about 20 minutes, or until the crust begins to turn a golden brown.
Let the crust cool before adding any filling.
Notes
If you are making this crust with a recipe where you bake the crust with the filling, just bake it according to the instructions for that particular recipe.