I've always used Kerosene on my oil stones. It has worked well but I will always pay attention to how the "old guys' did things. Most of the time if you can figure out how they worked it will be the best way, amazing what several centuries of passing knowledge to the next generation will do. Anyway I saw an offhand mention of Neatsfoot oil as the best honing oil, it was kinda written as an aside as if everyone knew that.
Bottom line I ordered a jug and have been using it. Does it work better, I don't know, but the iron feels good on the stone and my guess is it is better for my hands.
Any thoughts?
ken