Thanks for the input.  Bought a 2 1/2 gallons of ATF at the AGCO dealer for that part.  Just trying to avoid having 10 different lubes in the garage, Rotella for the truck, Plus 50 for the JD and AGCO for the Oliver, etc...  The more i can streamline it, the better chance I will never get into trouble.  I was told I could run the Hy-Gard in the Hydro too, just need to completely drain it and start fresh, NO MIXING!  He was pretty adamant about that.  Sound right???  Thanks again!