Chocolate Zucchini Cake

1/2 cup margarine
1 3/4 cups sugar
1 teaspoon vanilla
2 1/2 cups flour
1/2 teaspoon cloves
1/2 teaspoon cinnamon
2 cups grated zucchini
1/2 cup chocolate chips
1/2 cup oil
2 eggs
1/2 cup buttermilk
1 teaspoon soda
4 tablespoons cocoa
1/2 teaspoon salt
1/2 cup chopped nuts Cream together margarine, oil, sugar, eggs, vanilla, and buttermilk. Sift together flour, soda, cloves, cocoa, cinnamon, and salt. Add grated zucchini to creamed mixture, add dry ingredients. Put in a greased 9 x 13 pan. Sprinkle with chocolate chips and nuts. Bake at 350 degrees for 30 minutes. Chocolate chips and nuts can be left off and cake can be frosted with chocolate frosting.