mountig my first supercharger.

hi..

i need some help mounting my first supercharger. im mounting a lysholm style charger by IHI of a mazda (KJ05207AX) so i would like to know if im able to lubricate it with 20W50 oil from the engine or if it's to thick?
it has 3 oil "inlets" or ports on the uderside of the charger 2 small once ad one big one.
i can see that one of the small inlet's go directly to the rear bearings. i think that the big port is the return but i would like if someone could confirm this..
see pic.

hope you can help..