According to Jon Elson :
Bill Schwab wrote:

[ ... ]

Sadly, I am using "mystery oil" (10W30??) from a cheap oil can that I
filled a long time ago. I use it for things between light oil and
Vactra, which lives in the best working oiler I have on hand.

Gee, you DON'T want a lubricant for tapping, the idea is to let
the edge CUT the metal. Tapping formulas are made to help that
happen.

Except for roll tapping, I presume.

Enjoy,
DoN.

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