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I work at a powersports shop in my free time. We run into more fuel related problems then you can imagine. To get rid of lead in fuel, they had to include other additives. Olefins settle out and degrade, forming a waxy varnish layer on the parts making content. Olefins, if I remember correctly, are what determine the knock rating of a fuel. I could be wrong, so a more credible source would be great.
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