Preheat oven to 350℉. Generously butter and flour* 10-cup bundt cake pan (or choice of cake pan)*. Tap out any excess flour. Set aside.
In a large bowl, whisk together flour, baking powder, and salt. Set aside.
In the bowl of a stand mixer, rub orange zest into granulated sugar to extract fragrance and flavor. Pour in melted butter and oil. Attach paddle attachment to stand mixer. Beat mixture together until well combined.
With the mixer running on medium speed, add eggs one at a time, ensuring each egg is incorporated before adding the next. Add vanilla and sour cream. Mix until combined.
Add dry flour mixture in three additions, alternating with orange juice.Mix on low speed. Begin and end with flour. Mix on low speed until there are no longer any dry streaks of flour. Scrape down bowl as needed to ensure thorough mixing.
Transfer batter into prepared bundt pan. Bake for 60-65 minutes until cake springs back to touch and toothpick inserted in cake comes out clean. Rotate pan midway through baking to ensure even cooking.
Cool cake in pan for 15 minutes. Run mini offset spatula long edges of the pan. Invert bundt cake onto wire rack and unmold. Cool cake to room temperature before serving.