Originally Posted By: KCJeep
I don't know that I'd call that a "difference", I have seen variations of a few pleats even within the same line. For example I have seen Motorcraft FL-400S with 62 pleats, however the last one I counted had 58.
The last Purolator PL20195 I cut open had 67 pleats instead of the usual 60 pleats I counted in the two previous PL20195s I've cut open. The dimensions of the pleats were slightly smaller in the 67 pleat version, so total surface area was almost the same, which leads me to believe that Purolator changed the design of the media assembly.