Some extra Notes with regard to Friction Modification in General:
Friction Modification does not mean friction lowering alone, but can actually convey three meanings.
There are different friction modifier chemistries for engine lubricants, differential gear lubes, ATF's, Hydraulic Fluids, and MTF's.
Friction Modification in Tribological terms means we can increase friction (as in traction coefficient modifiers for CVT's), lower friction as in engine oils and greases, or modify it dynamically (as in relative motion between spinning parts).
There are Friction Modifiers in CVT fluid that increases the traction coefficient.
There are Friction Modifiers in ATF and MTF fluids that dynamically change the Friction Coefficient as spinning parts engage and disengage.
In engine lubricants, there is a friction modifier that reduces the Friction Coefficient between sliding and rotating parts.
In "street talk" people use the term FM as it applies to engine oils as in friction reduction in engine oils. Just because we use the term FM in engine oils doesn't mean we can apply the same meaning in all areas of friction modification.
So again, Friction Modification in Tribological terms means we can increase friction (as in traction coefficient modifiers for CVT's), lower friction as in engine oils, or modify it dynamically (as in relative motion between spinning parts in AT's and MT's).