RAV KOOK ON Chanukah: Flickering Lights in Dark Times

The Mishnah (Shabbat, chapter two) discusses which wicks and oils are suitable for Sabbath lights. Certain materials may not be used for wicks since they make ‘the flame sputter’ and fail to burn evenly; and certain oils may not be used because ‘they do not flow freely to the wick.’ With regard to Chanukah, however, the Talmud (Shabbat 21b) rules that these restrictions do not apply. Even wicks and oil that do not burn smoothly may be used for Chanukah lights. Why are all oils permitted for use on Chanukah, even when lit on Friday evening? Why this distinction between Sabbath and Chanukah lights?