Hydraulic fluids are more apt to foam than trans fluids are. I would at least make the move to Hy-tran. For my stuff I use what the equipment calls for. Since I now sell Amsoil, all the vehicles have it in them.
Where did you get the CASTROL fluid? I called in N.J. to castrol and nothing last year. Let me know please!! David.
1-800-888-4448 or (4449)....can't read my last digit i wrote down..
Castrol Blue Plus ISO-46
Also if you have any questions on this Fluid call William Cook owner of Cooks racing tranmissions...he's been in the tranny business for over 40 yrs and built 100's of High hp tranny's...he put me on this stuff.