Molybdenum disulphide, or Moly for short, is used both independently as a dry lubricant and as an additive in lubricating greases. Dry lubricants reduce friction between two sliding surfaces. This is exactly what the clutch is undesirable for a motorcycle with wet clutch.
Manufactures know Moly is a desirable friction modifier but they also
know Moly the oil additive will not defeat our clutch in good operating condition...
They know that the primary cause clutch slip are high mileage...
mileage is the constant among all of the clutches that begin to
slip... not whether BMW factory oil is equipped with Moly or not...
High mileage is the constant where all clutches begin to loose grip
due to normal glazing and contaminates that build up over time...
Have you noticed no one complains about clutch slip when the bike is new???
However around the 50K mile mark owners may notice slip especially if
they do full power up shifts during the rigors of a track day...
If you wish high mileage clutch life then you have to invest is some
good old sweat equity... Under scrutiny you'll find that your slip was
due to normal glazing and contaminates...
Inspect the friction plates for glazing... make sure you have plenty
of material to work with... your shop manual states clutch thickness
in thousands of an inch or mm...
First removed the contaminants with Acetone... pick a hard surface to lay
over a 600 grit black dry emery paper... rotate the clutch plate in a
circle... you're just busting the glaze... don't get carried away
remove too much material... You should end up with a friction plate
looks dull like a new one as opposed to a shinny glazed one... recheck
thickness...
Next check the pressure plates for bluing caused by localized heat...
make sure they are not warped... consult the manual for a thickness
range... now removed the contaminants with Acetone and wire wheeled
them to erased the blue and also to generally scuff up the surface...
you should end up with a dull surface free of Blue marks...