I am going to have to respectfully disagree, from what I have read, LSI has their own tp filter particle counts as well as the decades of Frantz's particle counts, paper density is the most important thing here, their studies say that after 2000 miles the particle count starts to creep up due to small micro channels that form between the plys, the oil starts to follow the micro channels through the roll, soft paper will begin to channel much sooner, yes soft paper will clean oil, but it won't last as long as "hard rolled" paper.