Cream margarine, oil and sugar. Add eggs, vanilla and sour milk.
Beat well with mixer. Mix together dry ingredients and add to creamed
mixture. Beat well with mixer. Stir in diced zucchini. Spoon batter
into greased and floured 9"x13" pan and sprinkle top with chocolate
chips. Bake at 325 degrees for 40-45 minutes or until toothpick comes
out clean and dry.