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http://www.stle.org/resources/lubelearn/lubrication/#regimes

From SAE paper 2012-01-1614, on Toyota's GF-5 0W-20 oil: "...a specific organic friction modifier greatly reduced friction under mixed lubrication conditions, compared to a conventional molybdenum-based friction modifier." Moly content, by mass: 0.01 GF-5, 0.07 GF-4

Thanks, that is very helpful.

As a proxy, might one hypothesize that viscosity is sufficient for a given component if an analysis of that component's oil shows that anti-wear additive levels are relatively normal?

Thank you for your response. I realize that many factors color the issue, and that a single sample holds little context; however, I do see OEM-issued viscosity condemnation thresholds from time to time. For example (table on fourth page)...

Yes.

A 15% drop in oil viscosity is often bandied about as a threshold that calls for oil replacement. Where did this figure come from? Is it relevant to today's low-viscosity oils? Low-viscosity ATFs?