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The oil companies are happy to prolong the myth that oil "wears out" when it fact it never wears out. Contaminates are what makes oil unusable and proper filtration captures those contaminates.
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How does one renew the detergent/dispersant packages ...
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Using bypass filtration there are 18 wheelers that go over 300,000 miles between oil drains.
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True, but ...
They are subject to frequent oil analysis, filter changes and make-up oil keeps the detergent/dispersant packages good.
To me, it is a lot cheaper to frequent quality oil/filter changes (especially today's engines) rather that pay repair/replacement costs.