BurbMan wrote:
From a practical standpoint, what's the impact on engine wear from a 22 micron particle vs. a 20 micron particle?
Practically speaking, absolutely none. Your engine sees much more wear every day from initial start up than such tiny delta in particle filtration. FRAM, once upon a time, wasn't a bad filter. However, I won't use them if you give me them for free! I bet the interval at which you change your oil that you aren't even reaching substantial breakdown, especially if you are checking with lab analyses...
Given your handle as well, you and Ben would both recognize me from the old PacAudio GM forum and well as the Sub-Yuk forum if I was using that username here! :B Clues are that I'm an old engineer and a long-proven gearhead with the two intermingled...
Stick with the Delco filter on the BB. Can't beat them all-around when purchased by the case! In addition to my old L31, I also had an L29 and have L18. :p