All of our lighters use premium lighter fluid. The best kinds of fuel to use on these lighters is multi-staged filtered butane. Normal filtered butane works fine too. Using filtered butane makes sure that there are no contaminants in the fuel. Unfiltered butane has contaminants in it that can wear out or damage the internal components of the lighter. Those can also clog the lighter jets from the inside. This will be very hard to fix so you will have to get the lighter replaced.