The references in the article has just a hair more credibility then dave the "oil guy", lol.
References
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Fitch, J.C., Scott, R., & Leugner, L. (2012). "The Practical Handbook of Machinery Lubrication - Fourth Edition."
Fein, R.S. (1991). "Lubrication Engineering." Journal of the Society of Tribologists and Lubrication Engineers.
Fein, R.S. (1997). "Boundary Lubrication Relations." Tribology Data Handbook.
Rabinowicz, E. (2014). "Friction." Access Science.
Mortier, R.M., Fox, M.F., & Orszulik, S.T. (2010). "Chemistry and Technology of Lubricants - 3rd Edition."
Rigney, D.A. (1980). "Fundamentals of Friction and Wear of Materials." ASM