(STOU) or a dedicated Hydraulic oil ISO VG 32/46 for the Backhoe? Forum › Forums › Tractor Implements › (STOU) or a dedicated Hydraulic oil ISO VG 32/46 for the Backhoe? This topic has 0 replies, 1 voice, and was last updated 13 years, 10 months ago by CTOA. You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In