Truthfully, I don't know the "proper" answer .... but logic says that hydraulic cylinders should be filled with hydraulic fluid. So as long as you use the right type it really shouldn't matter if you use OMC, Mercury, Shell, or Kmart. A fluid cannot label itself as Dexron I or II or ABC or anything unless it meets certain specs. So as long as the fluid meets the called for specs I would think it's fine to use. (And I've been using power steering fluid in my 200HP Mercury's trim cylinders for several years now with no problems) 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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