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They send you the oil sampling kit for free, then you pay $25 for a standard analysis and an extra $10 for the TBN. Blackstone says a TBN should be used for evaluating the life left in the oil, so if you want to extend your oil change interval it is a good check. To send the kit back I think it cost like $2-3 shipping at the Post office.
I'll do another full analysis after 7500 miles to see what that looks like. Should only take about 10 weeks :P
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