Seastar/Baystar use a fairly generic hydraulic oil; though the spec is for aviation grade stuff. Pretty much anything that's liquid (and non-flammable for safety) can be used; they apparently spec it high so that water contamination is kept to a minimum, which helps avoid corrosion of internal parts.
ATF works fine if you can't get hydraulic fluid (though it's a tad thicker and increase the steering effort just a bit.)
Thanks, I didn't get chance to phone black dog today but after some more searching on the web tonight I found other documents saying that LS recommend Dexron ii which is an ATF.
It looks like halfords stock an equivalent to dexron ii, so will that be ok?
