To Make Crust: In a large bowl, mix together 1 1/2 cups flour, oil, milk, 1 1/2 teaspoons sugar and salt until evenly blended. Pat mixture into a 9 inch pie pan, spreading the dough evenly over the bottom and up sides. Crimp edges of the dough around the perimeter.
To Make Filling: Mix together 3/4 cup sugar, 3 tablespoons flour, cinnamon, and nutmeg. Sprinkle over apples and toss to coat. Spread evenly in unbaked pie shell.
To Make Topping: Using a pastry cutter, mix together 1/2 cup flour, 1/2 cup sugar and butter until evenly distributed and crumbly in texture. Sprinkle over apples.
Put pie in the oven on a cookie sheet to catch the juices that may spill over. Bake 45 minutes.