Oil question for front axle

[fritzp]

Hoping there might be an oil expert that can answer this but if kioti factory filled my front axle with hydrolic oil could I not use this ATF when I do thee 50 hour service? I was always under the impression that ATF was superior to hydraulic fluid and wasn't used simply cause of cost. I have 3 crates of thiss ATF and no use for it. I also have a crate of synthetic 80-90 but feel that the viscosity of ATF would flowView attachment 782846View attachment 782847 better and lubricate the axle turning spindles better as they are integral to the axle.

I asked my Kubota dealer why they put hydraulic fluid in the front axel of my tractor. He stated that it was so they only had to use one fluid for all of the cavities. They used 80-90 gear oil when they replaced the front axel seals under warranty.