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OK, I'll bite. Why should I spend a little more for a
Wix 51056 oil filter? Not trying to start an argument but this is the first that I have heard of Wix. Also, where are you seeing the specs on Kohler filters? Is there a comparison or review site? Is this from your personal experience? I am not disputing your knowledge and I thank you for the info. )</font>
If you go to the Kohler site and download their engine accessories catalog pdf they give the micron ratings of their filters.
Kohler 12 050 01-S = 32 microns from their catalog
Wix 51056 = 19 microns from
http://www.wixfilters.com
This is provided they're using the same testing procedure for both. No way to know for sure about that. The Kohler filters appear to be made by Champion Labs. They make a lot of filters, from the low end Super Tech at Walmart to the high end Mobil 1 and K & N.
There is a lot of information on the web about oil and filters, who makes what, how well it works, etc. One place in particular where there is a very active forum about such things is here
http://www.bobistheoilguy.com.
Seriously, just trying to help...