I've seen conversations on this site regarding difficulty of checking Kubota fluid level through the sight glass. I asked my local Kubota mechanic about using John Deere dye in the hydraulic system. He didn't know so I checked with Kubota. Today I got a response and learned warranty will not cover any damages caused by dye in the hydraulic fluid. That tells me nothing as it's unlikely anyone could prove the dye was the root cause of any problem encountered. That strikes me as more of a way of saying they can weasel out of any warranty repair of any system with a trace of the dye in it. Use the dye at your own risk but be aware of possible consequences - like losing warranty coverage. The exact wording: "Kubota warranty will not stand behind any damages caused by the use of this chemical. "