I keep reading that UDT is no longer produced but the parts manager at work keeps ordering it and we keep using it in gear drive Kubotas.
In as much as it's manufactured by a 3rd party supplier (just like their filters are), I would imagine it's still available until Valvoline (I think that is who refines it) decides to discontinue it. If I had HST's I'd surely use their 'approved by OEM fluids). I don't so I use an approved by (meets their engineering standards) fluid, in my case Chevron, besides Chevron is dyed orange so I can see it.
My prime motivator in my choice of fluids is cold flowability and no pump cavitation at low temps. I use both my units for snow removal at sub freezing temps so the less cavitaion of the pump, the better I like it. Takes a long time to bring 15 gallons of fluid up to operating temp when it's way below freezing outside.
Again, you mileage may vary. I know what my mileage is and I act accordingly.
I stick with Kubota OEM filters for a couple reasons. One, the cost isn't much more than say the red ones and two, in my case, my VTE enginees in my M9's have no drainback check valves in the lube oil system except the drainback valve in the filter itself and being a plain bearing engine, I want oil pressure at startup and the 'other filters;, I have no idea about the design internally, so I buy the OEM because they are made to Kubota engineered specs.
I'm in a nice position with my dealer in as much as all my supplies I use from my dealer are tax free (remember I'm a commercial farming operation so anything AG related is tax exempt and my dealer is very economical on supplies, but then I' m a good customer anyway and they appreciate that. My dealer handles all the 'heavy lifting' on both my M's and always has plus I bought them there, over 100K worth of prime movers and that don't include implements.
I like dealing with a one stop shop anyway. I don't have the time nor the desire to price shop, especially don't have the time.
