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  1. 100,000 miles; Amsoil oil analysis @ 3771 mi/5 mo and extended intervals

    General Discussion
    As usual, I run an oil analysis on a sample of my oil around every 5,000 miles. Below are the results. (Note that Sample #1 is Royal Purple, the rest are Amsoil's Signature Series) This most recent sample I didn't run it as long because I wanted to send the sample in at 100,000 miles...
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