Preheat oven to 325°F (165°C) and grease a bundt pan.
Cream butter, oil, and sugar until light and fluffy.
Add eggs one at a time, mixing well after each addition.
In a separate bowl, whisk flour, cocoa powder, baking soda, baking powder, and salt.
In another bowl, mix coffee and sour cream until smooth.
Alternate adding dry and wet ingredients into the batter, beginning and ending with dry ingredients.
Mix until just combined.
Pour batter into prepared pan.
Bake 60–70 minutes until a toothpick comes out clean.
Cool before removing from pan.
Prepare glaze by whisking confectioners sugar, vanilla, and coffee until smooth.
Drizzle glaze over cooled cake before serving.