Katahdin
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I think I made that comment so I'll attempt to explain the logic behind it. In Westfolk's install video he mentioned changing the smaller filters after a drop in oil pressure occurs. The smaller filters would get clogged quicker then a larger one, etc. It makes sense to me based on the documented oil pressures in the TMs. Depending upon the engine model, the minimum oil pressures documented in the TMs are either 10 or 15 psi at idle and 40psi at max rpm. If I saw the pressure approaching the minimums at either of those conditions I'd probably start shopping for a new filter.
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