There are numerous discrepancies with this article, one of which is that the ASTM D 4172 specification is just a sliding surface gear and pinion wear test for differential gear scarring. This test is a requirement for API certification of all motor oils. It is a measure of how much wear an oil will allow between two moving surfaces, like between piston rings and cylinder wall, or even better the main crank bearings.

Tom

Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety. Benjamin Franklin, US author, diplomat, inventor, physicist, politician, & printer (1706 - 1790)