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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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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