Not really ... but an oil filter can become that way only when the filter is almost 100% clogged and probably already in or very near to bypass, but nobody should be using them that long.
It's been shown - even with Andrew's ISO 4548-12 lab testing - that oil filters slowly lose efficiency as they load up. Some are way worse than others. Oil filters with a high ISO efficiency are much less likely to lose efficiency with use and loading. That is one positive reason to use a high efficiency oil filter, especially if doing long filter change intervals.
If you read this thread from the point the link puts you, the phenomenon of efficiency lose is discussed in more detail.
I have this as a “watched” thread, so if you do happen to start a new one, could you put a note or link in this one to direct followers to the new thread? Thanks!! Yes, no problem I can do that.
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