Aren't they already? Pretty sure that's what the Light/Heavy Oil recipes are for, and there's another recipe somewhere that turns PFAA Natural Gas into GT Methane
Unless you're talking about for the Distillation Tower?
Oh, i haven't found any recipes with bucket and for oils in general with NEI and i thought there were none. It seems you can only see them through distillery. But there is one bug i found: If you try to fill bottle with oil you will get water bottle.