In the time of pre-internet, I used to use Fram filters exclusively. But after I saw the comparison that showed how bad Frams were, I switched to AC-Delco (which was highly rated.........~15 years ago). When I couldn't find an AC-Delco filter for my application, I chose Wix or Purolator. IMO, the K&N, Bosch and Royal Purple type filters are over-rated and over-priced and are relying on brand-association to sell the product (although I still think K&N's air filters are superb). While I have not attempted to keep current w/ the current production units of the various brands (or the now numerous "reviews" of them), I'm sticking primarily w/ AC-Delco (although I now use Wix for my Olds since its really hard to obtain AC-Delcos for that for some reason....nothing like feeling abandoned by the mothership).
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WIX was owned by Dana Controls until a few years ago when Charlie Dana sold the assembly plants and name to Affinia Corp.. Affinia now markets 3 filters that all are essentially WIX filters/clones. PartsMaster, WIX and a series of HD WIX filters. AMSOIL sources their filters from Affinia - same as many other name brand filters are all made by the same company in the same plant - one brand gets them white with decals, one company gets them blue with decals, one company gets them black with decals. K&N is overpriced/overhyped, made by Champion Labs, I believe. AMSOIL and its (retired USAF fighter pilot) owner are damned particular about lubrication and reliability which may say something about why they source their oil filters from WIX.
I run WIX exclusively in the car and trucks and Fram HP-2 filters in my Olds 455 marine engine conversions. (I would not run a "stock" or Tough Guard Fram in a blown up Briggs & Stratton lawn mower)(That Fram HP2 holds a full quart of oil............)
http://www.minimopar.net/oilfilters/
http://www.minimopar.net/oilfilters/opinions.html
I run WIX exclusively in the car and trucks and Fram HP-2 filters in my Olds 455 marine engine conversions. (I would not run a "stock" or Tough Guard Fram in a blown up Briggs & Stratton lawn mower)(That Fram HP2 holds a full quart of oil............)
http://www.minimopar.net/oilfilters/
http://www.minimopar.net/oilfilters/opinions.html
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Yea, but two years ago we got Wix and ACDelco filters from a NAPA in Minot ND. When we got home, we compared them (even for part #'s and history) and they both came back to be manufactured by Wix. 
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