I typically use Jetline or Xikar butane. I had problems using Zippo butane in a Xikar once. It started to sputter and cough. After I purged and refilled it a couple times with a better refined butane, the problems went away. Interestingly enough, my cheap Ronson Jet Lite lighters seem to do just fine with the cheaper stuff. My guess is it has to do with manufacturing tolerances.