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Jantz Supply has three oils now.
Parks 50 and Park's AAA and Citgo Quenchol. They run from $42 for AAA, $55 for 50 and $50 for quenchol per gallon. I used Quenchol for O1 and 440C as its viscosity is a little thicker than 50.
Note something about O1 tool steel, its manganese content is the highest around for high carbon alloys. I only buy the type that has vanadium in it for its ability to restrict grain growth.
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