according to my manual-trans SAE 80.being that this is also the hyd.sump.never heard of running 80 weight in a hydraulic system.i have the kubota operator and workshop manuals.nothing in the hydraulic section on fluid.going over a tractor that sat for years,checked all levels and condition,got it running and moving.while im at it if you are reading this you probably own a L245DL best place for tires and wheels.