Instructions: In a saucepan, bring Coca-Cola, oil, margarine, and cocoa to a boil, mix the sugar, flour and salt. Pour into the boiling liquid and beat well. Add the eggs, buttermilk, soda, and vanilla and beat well.

Pour into a greased and floured sheet cake pan, and bake at 350 degrees for 20 to 25 minutes.

Frosting: In a saucepan, combine the butter, cocoa, and milk and heat until the butter melts. Beat in the remaning ingredients, and spread on the hot cake. Cool and cut.

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