Just like the title says is it compatible. I'm going to be doing a service on the hoe at work and thinking of reusing the oil in a 580B, just dont want all the seals to start leaking at once.
I agree. Check out the Case equivalents for the 580B to see if it's listed. Do you have a 580B service manual?
I did find this reference that says it's a replacement: Low Temp Hy-Tran Ultra may be used in all applications where Case PTF, TCH and International Harvester Low Temp Hy-Tran fluids were formerly recommended. I found it here: http://www.viscosityoil.com/pdf/P13_24.PDF