Cream butter and sugars. Add eggs and salt. Beat well. Beat in oil and vanilla. Sift dry ingredients together and mix in. Makes a very soft dough. Drop by scant teaspoons onto ungreased cookie sheet. Oil bottom of a glass - dip into a dish of sugar - flatten cookies on pan. (One oiling will do - the oil in the cookies will take care of it). Dip in sugar before every cookie. Bake for 8 minutes at 350. Makes 7 dozen. Store tightly covered