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I have used Blackstone for years and regularly go 10k between oil changes on my '06 diesel. I am not a full timer so my vehicle isn't always pulling a load, but the tests still comes back with great results. The first couple of times it showed some wear which was normal for a new engine breaking in and has since settled down to a normal wear routine. They track your past samples and record them for future use. If they see a pattern they will warn you about something to look at before it becomes a problem. The test results will show your past results compared to the current one so you can look at what they are seeing and why they are making recommendations to look at certain parts that may be wearing out prematurely.
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