CourseMaster Hydrive Ultra 15 hydraulic fluid equivalent

[chris07732]

I'm struggling to find specifications for the Hydrive Ultra 15 hydraulic fluid specified for my Coursemaster autopilot. In the states, the Hydrive Ultra 15 is extremely expensive (and only available from dealers). I'm looking for a lower cost alternative. The Tellex SeaStar fluid is not clearly equal as i read the specs.

tia,
Chris
s/v Spartina

[bmartinsen]

Any luck finding an replacement? I just bought an aussie boat and need steering oil. It can't be that golden.