How do I remove callback for oil etc.?

[palistov]

If you want to use a custom tinderbox just use AddUseItemCallback(string& name, string& item, string& entity, string& callback, bool destroy); for both the oil and tinderbox and the script area.

Use a local variable or some other tracking method to make sure the oil has been used, and then you can allow the tinderbox to be used on the oil slick area.

Give it a shot, I'm sure you can get it working