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Discussion Starter #1
The stock air filter on the V6 has two Mazda stock numbers, RF4F13240 and AJ57-13-Z40. I have no idea why a single number would not suffice.

Third-party replacements are available from Wix (42885) and Beck/Arnley (0421663).

Theoretically, Purolator (A25585) and Hastings (AF1249) also make reoplacement air filters for the V6, but I have never seen either in the wild.

My question is, aside from price, is there any basis at all for choosing among them?
 

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Discussion Starter #5
K&N also make a drop in filter for the 3.0L

http://www.knfilters.com/search/product.aspx?Prod=33-2279
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If you are a devotee of the Oil Drop Guys at bobistheoilguy.com, then you learn that the rough (emphasis on rough) consensus there is:

Oil filters: K&N si, PureOne si, Fram no no no.

Air filter: Fram si, Baldwin si, K&N no no no.

The rap on the K&N air filter is that it is much too easy to over-oil the media.

Of course, the Oil Drop Guys may be wrong.
 

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Discussion Starter #8
Before I changed to CAI, I was using K&N drop-in filter. No problem whatsoever. I did UOA and it didn't show anything irregular either.
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Yes, your fine record-keeping on your experiment using GC oil shows that you are meticulous. The rap I had seen on the K&N air filter was that klutzes (like me) are likely to fark up the works in oiling the cotton filter; the problem is not inherent in the filter, but rather in klutzy user error.
 
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