Blackstone... but cautiously.
Oil analysis isn't all that it's cracked up to be and I've seen some mistakes. It works best over time when you see trends and if you get a crazy reading, it could be just that.
I've had a few crazy readings over the years and won't do anything major right away. (Once I pulled and replaced three cylinders on an aircraft engine because of a false reading from Blackstone). So, I get other info, like temps, exhaust color, etc.
I've been using Blackstone for several years, but prior, used a smaller but more accurate guy in OK who retired.
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Seevee
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