While there are a few dirt tracks around that will still spray waste oil, it is now illegal to do so in the US (at least as far as I know, maybe someplace still allows it but I bet nowhere in CA).
I have heard of some tracks spraying sugar water on it, which sort of glues everything together and makes it hard, low dust, high traction. I hear it also means HIGH tire wear. I've never run one myself though so I could be wrong.
Your best bet is probably going to be to just water it and add some sort of wetting agent to the water. They are commercially available or for a cheap and easy alternative, just add some liquid dish soap, does the same thing.