Preheat oven to 350°F (175°C).

Gather all ingredients.

In a large bowl, cream together oil, sugar, and eggs.

Add vanilla and pumpkin to the creamed mixture.

In a separate bowl, whisk together flour, cinnamon, allspice, cloves, nutmeg, baking powder, salt, and soda.

Gradually add the dry ingredients to the wet ingredients.

Mix until well combined, being careful not to overmix.

Grease and flour loaf pans.

Pour batter into prepared pans.

Bake for 1 hour and 15 minutes, or until a wooden skewer inserted into the center comes out clean.

Let cool in pans for 10 minutes.

Remove from pans and let cool completely on a wire rack before slicing and serving.