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Originally Posted by Penguin
Most oil filters have much more capacity that is ever used, and a partially loaded oil filter actually filters better than a brand new filter, i.e., with modern engines it would make more sense to change the oil more frequently and leave the old filter in-place than vice-versa, IMHO. Don't get me wrong, I am NOT proposing this, simply suggesting that using old oil with a new filter has little, if any, benefit.
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without starting the next great oil debate, i must disagree with your theory. the filter would seem to be the weak point in the scenario. many people have extended the life of their motor oil well past recommended intervals with testing to verify the oils performance, but almost all swap out filters to maintain optimal cleansing.