Friction modifiers additives are only a small percent of the total oil product and help
the base oil do things that it otherwise could not... Additives fall into several basic
categories but Moly, Phosphors and Zinc are the most often used friction modifiers... what
ever small percent of FM employed they will not defeat a wet clutch in good working order...
The holy trinity of science is 1)Reason 2)Observation 3)Experience...
employing those tools we observe that the primary cause clutch slip
are high mileage... mileage is the constant among all of the clutches
that begin to slip... oil choice whether JASO approved or not is not a
constant... High mileage is the constant where all clutches begin to
loose grip due to normal glazing and contaminates that build up over use...