then adding more butane wont fix ur problem it needs to be purged, what ever is in there from the crappy butane, like the paraffin
wax or the perfume they use, more refined butane wont get it out your best option would be to purge it better
turn the oven on to 180 or so leave the door open after it heats put the oil in thr for a few its already crappy u say turn it back to a liquid to let the tane evaporate properly