Cream together margarine, oil and sugar until very well blended. Add in milk and vanilla and blend. In a separate bowl, mix together the flour, oats, baking powder and soda. Stir dry ingredients into wet ingredients. When half blended, add in the walnuts and chocolate chips. Mix everything until just blended, careful not to over mix. Refrigerate for 20 minutes. Place by the tablespoon on a greased cookie sheet. Bake at 350°F for about 10 minutes. Makes 2 dozen cookies.