In case anyone cares to know. After doing a little research I found out that both Castor oil and Ballistol are plant based water soluable oils so I see no reason why it (ballistol) couldn't/shouldn't be substituted for castor oil in the moosemilk recipe. Whether it is better, worse, or no noticable difference remains to be seen. I used ballistol when I made up my batch of moosemilk because I had it on hand. I have not made any with castor oil so I cannot speak from experience of any differences or similarities. I definitely like the way the batch I made is working. I have yet to try Liquid Wrench....BPS