[header] How to turn a disposable lighter into an oil candle [title] Get a disposable lighter that is empty [title] Take off the flint wheel holder by prying it with a screwdriver or other tools. [title] Remove the valve by twisting it, you can use the adjust wheel for this. [title] Remove all the insides (the tube and a stopper ) [title] You will see a hole where the gas would have come out of. 
[title] Get a filling tool, e.g. [step] A syringe or tube small enough to fit it into the hole.