There is a BIG difference in what is sold as PS fluid. Some of it is no better than bulk tractor hydraulic fluid, and some is thin as sewing machine oil. Even the stuff that meets OEM specs varies with the company it is made for. It is tempting to get clear fluid in case it leaks. But unless you need the seal swelling stuff until you fix it right, do not do it. My manual says type F, but use what your year says. I am tempted to see if Royal Purple or someone makes synthetic type F next time as it does not get changed regularly like the motor oil.