Way late here but my Rural King has 5 gallon buckets of UTF for $19.99 this week only. I have never seen it that cheap. I believe the brand is Extreme. Its in a green and yellow bucket.
I have run the cheaper brands in my JD 4020 and the tractor runs perfect. Bought a 4050, changed to the off-brand and the trans shifted fine but I got some brake shutter on step slopes while mowing. I ended up draining the cheap and returning to the Hy-guard with no more brake chatter. Good luck.