Attached is the latest UOA for my T4 MX-5. The previous fill was M1 5w20 by the previous owner who also used leaded fuel. I'm now running Redline 30wt Race Oil and running 100 octane Street Legal unleaded fuel. The big surprise to me is the increase in Copper over the previous sample. I did change the air filter mid-OCI and ran some pretty dusty tracks during the summer so the increased Silicone doesn't come as a surprise.
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