[aerohead]

You keep adding more elaborate versions of the same falsehood.
The authors are using nomenclature which clearly describe lubrication processes which have absolutely nothing to do with automotive lubrication:
1) 'coefficient of friction '
2) 'sliding friction '
3) 'pin-on-disc' testing
4) 'viscosity increase '
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If you're to 'help' Ecomodder members and guests, you'd be better off limiting your research automotive tribology, where the challenges lay with 'reduced' viscosity.
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Boron - nitrogen, extreme-pressure, anti-wear agents have been added to motor oil since 1973 ( CHEVRON-TEXACO-CALTEX ), along with Zinc, Sulfur, and Phosphorus.
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Your arbitrary addition of boric acid could threaten the integrity of micro-textured isotropic surfaces which facilitate lubrication.
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Falex washer-on-ring superfinish sample testing of coefficient of friction has produced component scuffing failures at 580-rpm ( lower than the 'idle speed' of most automotive engines ).