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Amsoil.28%-37%I believe redline S1 is more potent by using 1 or 2 bottles per tank. Some people online is using 1/3 of a bottle per tank but it doesn’t do much in term of clean carbon buildup.
FYI: see photos

Amsoil's pi SDS is 25<50 Alcohols, C12-15 Propoxylated, Aminated which is PEA.I wish that I could still see tiny characters like that, but those days are long gone.
What is the definition of the expression 20 - <40?
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https://safetydatasheets.phillips66.com/Webviewer/DirectSearchResult/Result?product-id=830019#
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