In a large bowl, stir together the cocoa and baking soda.
Add 1/3 cup vegetable oil and boiling water. Mix until well blended and thickened.
Stir in the sugar, eggs, and remaining 1/3 cup oil.
Add flour, vanilla and salt.
Mix just until all of the flour is absorbed.
Spread evenly into 9X13 inch greased and floured baking pan.
Bake in preheated 350-degree oven for 35 to 40 minutes, or until a toothpick inserted into the center comes out clean.
Cool before cutting into squares