Manitou SemiBath 5W40 oil is 87 cSt @ 40°C
It is the same Motorex Power Synt 4T 5W40 that we sell as Motorex Fully Synthetic

This oil is used in the lower legs to lubricate fork bushings and seals.  It has been used since 2003.  Lower leg volumes usually range from 10-16cc per side.  But some forks use more.
Alternative oils for bushings are:

Motorex Supergliss 100k - for ultimate lubrication.
Motorex Supergliss 68k - thinner supergliss for cooler temperatures.
Motorex Polar 0W40 - for riding in the coldest temperatures.