.. Years ago when Uncle Sam forced the eliminaltion of lead as a fuel additive, there were many such products (in several formats) for folks to put lead back in unleaded fuel. As I recall removal from lead burned the valves in some preunleaded vehicles. I can well remember using some forgotten brand of fuel additive (kind of like I'm doing now in my D'max) to protect the engine in my truck of that era. However, I don't ever recall seeing one quiet like the one you've found ... Jim
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