I have a 2nd hand Massey 12 Hydro with the expansion tank. The hydro has mostly been good aside from needing linkage work shortly after I got it. I have the reservoir under the seat which has always had some oil in it, so I have simply assumed it was Ok. Now I'd like to add some oil as the reservoir has gotten low, and I'm not sure what is in it. I've heard Dexron was the initial oil, so I was about to add some, but noticed what little was left was not as red as what was in the Dexron container. I've loosened the drain plug and got a few drops on my finger to look at and smell. It has a faint red or amber color, but again not like Dexron, or Type F ( which I understand should not be mixed). It smells "hydraulic" but I have no clue what it actually is.
Can anyone help?