i found the sight glass for the oil level on the side of the transmission by the clutch pedal and noticed it was not visible in the sight glass. i just picked this unit up from auction. i went to the local kubota dealer and got some premium udt which is what they recommended. do i just fill from the oil port under the rubber cap on the floorboards or do i fill from the oil port on the rear of the tractor above the 3 point hitch? sorry i dont have any photos