I dry the oil stones with the oil inside,then I put them in the freezer until I have enough to fill a gallon jar.I fill the gallon jar with the dry stones then fill the jar with mineral oil.Then age this for 1 year in a root cellar or cold room in the basement.Then I drain off the mineral oil for use in lure,or alone,and refill the jar with new oil(same stones).You can do this several times,then make a new batch.You can use the spent stones for a lure/bait.
After a year the mineral oil will be brown and have a powerful oil stone oil smell.
You can see a bit of the brown mineral oil in the bottom of the jar.