Reuse the filter. I'm on the same
filter 3 years later.

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Penny wise, pound foolish, IMHO.

Perhaps, but I have yet to see any water or grit or anything at the shiny
bottom of my spin-on filter. I always get my gas at a roadside gas station.
Are there some unseen small particles possibly clogging up the filter, or do
you suggest changing it just "because".