Stir cocoa and baking soda in a medium bowl. Blend in 1/3 cup vegetable oil. Add boiling water.Stir until mixture thickens. Stir in sugar, eggs and remaining 1/3 cup vegetable oil; stir until smooth. Add flour, vanilla and salt; blend completely. Pour into lightly greased 13x9x2" pan or two 8" square pans. Bake at 350 degrees for 35-40 minutes for 13×9/2" pan, 30 minutes for 8" square pans. Cool; frost, if desired. Makes about 3 dozen.