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Don't use Tap and Die to clean threads, get Thread Chaser kit. See article below it comes from The Bulletin Mechanic July 2007. And as far as the break in oil I would do a little research on the internet.
Wes

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What Wesley advises is certainly a preferred good practice and removing metal from existing fasteners (except when providing clearance for plating) is to be avoided, but Washburn's statement that using a tap or die "will be removing existing threads" is not necessarily true, it depends on the class of fit of the existing threads and the class of fit that the tap and/or die have been designed for. There are numeric specification for the various classes of fit but this chart from McGraw-Hill's Pocket Reference for Machinists and Metal Workers gives the various designations and some insight.

The class of fit should be considered when you purchase taps and dies. Personally, I don't have thread chasers and just use a well-worn 1A or 2A tap/die, saving the newer ones for actual thread cutting.

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