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What Boric Acid does to metal wearing surfaces was a fortuitous find (IIRC) by Argonne National Labs, not some snake oil salesman.
(He prints money with impunity instead nowadays)
I'd post a link if I could... and if I thought it'd win out over ingrained opinions...
NB that Boric Oxide + Water = Boric Acid.
ie: What's sold as 'Boric Acid' isn't.
Its Boric Oxide till you add water.
Your engine will add the water to your oil for you if you have the patience.
That wont happen in a diff or gearbox.
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