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Hard to tell. Probably work better than the 20w that's in there now when cold but not sure when it warms up. Honestly I'd be willing to take a slight hit in speed when warm if I don't have to wait so long to move the tractor when I need it. I'm often running it for just a few minutes anyway.

A little insight here. I looked in the service manual again and it does say that the hydraulic system with an SAE 80w oil has an operating range starting at 59*F, so I think I may just have my answer there. I am still hopeful that an oil with a lower pour point will help though.

There's a priority valve that partitions some fluid to the steering at all times. It's not adjustable. I actually replaced this part and had the original in pieces. The assembly is crimped and you have to destroy it to get at the spring to change shims. As far as the L245DT similarities, this...

Okay, so I've been chasing my tail on this for a bit to the point that I'm almost ready to redesign the hydraulic system, but I think I may just have an issue with the fluid now that we're getting summer temps here. I've got a tractor that calls for the Kubota UDP fluid. It's a rebadged L245DT...