they say mobil 1 5w30 but i'd use 0W20.
rotor pack bearings are touchy in the sense that the seals cannot be replaced without modifying the rotor pack housing dealio.
The seals are held in by an aluminum lip.
Grind that out, then you need to modify it to keep the new ones in place.
Might want to ask ZZP how much they want for a new rotor pack.