Kubota r420 hydraulic fluid

[chilson450]

Im working on a Kubota model r420. It is a mini loader with a Kubota diesel. The manual and sticker say for hydraulic fluid to use 10w30 CD rated oil. I'm not sure what is in it now. The previous person wrote super udt next to the filter numbers that they wrote down in the manual. So I'm guessing that's what's in it. It may be what kubota says to use now. I know 10w30 diesel rated oil is available and would be a thicker fluid.
What are your thoughts on this? I plan on putting t6 10w30 in the engine.

 

[dlundblad]

UDT existed when this machine was made so there must be a reason for the 10w30.

I’m not sure what the difference between the 2 is for this application, but I’d stick with 10w30 and do a full change. It’ll be a lot of oil.