Preheat the oven to 350 degrees F. Grease and flour a 12-15 cup bundt pan.
Using an electric mixer, beat the oil, buttermilk, eggs, vinegar and vanilla on low until well combined.
In a separate bowl, sift the flour, sugar, baking soda, baking powder, salt and cocoa together. Slowly add them to the wet mixture until just combined. Scrape the bowl and mix again.
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