Filed under: 2001 Ford F-350 superduty (betty)http://www.di...ll/index.html I installed the oil by-pass system on July 2 and switched my oil to Royal Purple. I had all the other fluids changed to Royal Purple two weeks earlier by a mechanic. Hopefully the mileage will improve by the 10% they claim. So far it looks like it has, I will find out tomorrow when I fill up. I installed the by-pass filter to extend my oil changes and keep the small particles out that the full flow misses.
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