Heat oven to 425°F. In medium bowl, combine flour, sugar and salt; mix well. In small bowl, combine oil and milk; blend well. Pour over flour mixture. Stir with fork until well mixed. Press in bottom and up sides of 9-inch pie pan; flute edge. (If desired, crust can be rolled out between 2 sheets of waxed paper.) Prick bottom and sides of crust generously with fork.