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They've been useful for me. I'll occasionally send off a sample for one car another just as a first-order monitor of engine health. Once, some years ago, I started hearing a little ticka-ticka-ticka from an engine and suspected that maybe my rod bearings were starting to go. Sent off a sample for analysis with comment to the above effect and got a clean bill of health.
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'80 SC Targa
Avondale, Chicago, IL
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