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TBN/TAN Crossover?

http://www.gf-5.com/uploads/Fi...ystem_Powerpoint.pdf

According to this report done by Lubrizol, the TBN/TAN crossover occurred around 3,400 miles. At that point, it the oil may be near the end of it's life. I assume better oils can go a lot further than 3,400 miles if designed right...?
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