Filters actually get better at filtering small particles with age until they clog too badly. And new oil tends to be dirtier particle wise than new oil going in. The new oil does restore the additive load and gets rid of acids and ash etc.
Big fleets often pre filter oil before filling equipment to get more time between rebuilds.
My tractor has a 100 hr interval on a straight hours meter. I change at 100 hours but if it had a larger sump I would go out to 250 hours. It holds less than half the oil my last tractor of the same hp held.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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