"Norm Dion" wrote in message news:cB2Ec.130610$0y.27082@attbi_s03...
Does penetrating oil lose it "potency" over time?


This is Turtle.

A life time of use if you keep the lid tight.

I have a Gallon of Marvel Mistry Oil that i found in my Shop from the 1950's and it was good as ever but it had the lid tight on it
when it was stored up.

TURTLE


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