Preheat oven to 350 degrees. Prepare three 8-inch round pans with oil and cocoa powder and set aside.
In a large bowl, combine flour, sugar, cocoa, baking soda, baking powder and salt.
Make a well in the center and pour in the eggs, coffee, buttermilk and oil. Mix until smooth; batter will be thin.
Pour evenly into prepared pans. Bake in the preheated oven 25 to 35 minutes or until a toothpick inserted into the center of the cake comes out clean. Allow to cool completely.