Xevyr
7
As the above comment says, you can only add oil to it when it’s empty.
The way it works is that there’s an override of the interaction function that checks whether the placeable inventory contains oil, if not, then it performs the default interaction (opening up the inventory), if yes, then it performs the repairing of your items. So there is no inbetween option, you literally cannot open the inventory while there is still oil inside.
It’s fine though as a single item repair costs a single piece of oil, so you will never get partially repaired equipment because the oil ran out. You can just refill it then use again to repair the rest of your hotbar.