Agree fish smell one of diy indicators it pea. I believe higher pea will darken color too.one to look where nitrogen base ( most where complete fuel system cleaner like redline s1, Techron complete, marine, small engine, gumout regane product stp complete I believe sliver bottles. Lucas deep clean . Royal purple max clean, Rislone complete fuel system cleaner , cheapest that find has pea Rislone upper cylinder lubricant 32 oz for $5.90 % of pea but Rislone will put very little .I like Techron concentrate plus and redline s-1 higher pea to price ratio today in market .Fish smell
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