All oil 'starts it's day' thru the filter, however it's not flowing in a "series" fashion (one big loop), but rather thru parallel circuits (by-pass).
In addition, that returning low-pressure/low volume "cold" oil from the cooler doesn't just "dump" back into the sump. It's routed thru the lube circuit first and then bleeds off to the sump.
Long story short, this means that the good guys are continually being mixed in with the bad guys ahead of the filter. Good news is that due to the routing and pressure differences, the new oil will eventually win.
Ever notice that it takes a good 20 quarts to flush out a 12 quart system this way? :>)
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