I find this post interesting, because I have the same issue I planned to ask about on here. My newly rebuilt 400 had oil change at 500 miles and filter looked good. Now, changed oil at 2500 miles and sent a sample in for analysis and they also said lead was critically high. I run premium unleaded because it's the only non-ethanol I can get. I run no additives with Driven GP-1 10w-30.
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