85w140 and 80w90 leaks out a little slower than UDT but it still leaks out. I have an L4330 in the shop now that customer neglected. His front axle repair is about $4000. Set of seals and $250 would have solved it last year but he didn't have time to mess with it. Kept pouring oil into it. Forgot to check it while he was in a big hurry to put out deer food plots. Instead of seals and 2 bearings, it's now differential, it's bearings, hub seals, kingpin seals, caps, axle bearings, kingpin bearings, shims, ring & pinion gear, and lots of labor.
After while pouring oil into it every so often also gets expensive. I understand putting it off because of financial reasons but at some point it's going to have to be done. The more one uses their tractor, the higher the chances that something else will go south. Mine, too, leaks, but I have used it twice this year. It's leaking and I'm not going to mess with it until I fix the leaks.