Would that be 'current' lamp oil or when lamp oil = whale, dog fish, olive oil?
I know part of the Roman Soldier's 'rations' was garlic - used for energy but also for medicine, the same as it was in WWll - pass the crushed garlic over a wound and the oily vapor would kill even gangrene -
A Roman soldier caught without his garlic was disciplined
Olive oil ... you can even make a battery with olive oil because of the pH.