Rex,
Might be good to post a photo or give an exact position so that we are sure of what information we are providing you. My suspicion is that it is the power steering and fan drive fluid (if side radiator) which is auto transmission fluid (Dexron 3 in your coaches era). The follow ons to Dexron 3, Dexron 4,5 etc are compatible with that fluid. You can dip your finger in and check the color, if redish and oily that is what it most likely is.
Later Ed