mwilk012
Well-Known Member
That data is straight from WIX, 50% at 13 microns and 98.7% at 35 microns. I suppose the difference is small, to each their own.They don't define that and don't cite the standard test. That could mean the smallest particle it can filter is 13 microns. The Fram is purported to filter very well even in the 5 micron range, according to a former Fram engineer on Bitog. I can't remember the percentage, but it was surprisingly high, as I recall. Anyway, Wix told me the number and it was not close to the Fram.
That's not to say the Wix isn't good. Millions of users get long engine life with them.
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