Pay extra close attention to Matthew 25:3. It says, clear as crytal:
"they... took no oil with them."
I repeat:
"NO OIL."
Not too little, not enough, NONE! Zero, zilch, nada, empty!
Get it?
They can't run out... they don't have any to begin with.
What is the Oil?
It's Jesus, the Anointed...