Good Olive Oil, makes the ferretone lasts longer. I also put in another oil for keeping their coats healthy and shining too. These 2 are so beautiful! Taz will let you pet him and go to sleep on your lap. He was in the dead zone when I put him down, still sleeping away. Bee coming to us for ferretone, just loving it. I see Jim and Taz sleeping together so cute. BCMarie and her 9 Most Wonderful Fur Kidlets [Posted in FML issue 5169]