Chocolate Buttermilk Cake

1 cup vegetable oil
2 cups buttermilk
2 cups granulated sugar
2 teaspoons vanilla extract
1 teaspoon salt
3 cups flour
6 heaping tablespoon cocoa
2 teaspoons baking soda

Mix oil, buttermilk, sugar, vanilla extract, salt and flour. Add cocoa and baking soda. Mix well. Pour into greased and floured 13 x 9-inch cake pan. Bake for 25 minutes at 350 degrees F.

Icing
3 tablespoons flour
1 cup milk
1 cup butter
1 cup granulated sugar
1 teaspoon vanilla extract
Water

Cook flour and milk until thick, stirring constantly. Cover and put in refrigerator until cool. Beat butter until fluffy; add sugar, vanilla extract, flour-milk mixture and enough water to reach spreading consistency. Frost cool cake.