This is from a former parts person. There have been split open fiter displays at parts counters for years. I never was comfortable with the filters with paper at the end of the filter media. What glue might not melt and what cardboard holds up in hot oil??? Looking at the chart, Fram is not the only one. Delco has been another big name made that way. People with money to burn, ones who operated their trucks in harsh enviroments, and others who wanted to make the motor last the longest always insisted on WIX. People who changed their own oil every 2000 miles in their street car tended to be less picky about the filter.