dexron 2

[smokeonthewater]

DON'T use ATF of any flavor.... 10-30 is the way to go.... ATF can do TERRIBLE things when mixed with water..... It doesn't always happen but you can end up with the thickest nastiest pink goop ever that is a nightmare to clean out where with motor oil if some water enters the system all you get is milky oil... I would flush out the atf and run motor oil myself

to answer your question each generation of dexron atf superseded the previous generations stating that it was safe to use in applications that called for the earlier version..... Since it was never speced for power trim systems one couldn't say for sure but it SHOULD work the same and be compatible with the same materials....

[Destroyer]

I've always used hydraulic oil... (the type you use in hydraulic jacks) Never had a problem with it, but now that I know about 10w-30 I think I'll start using that. (cheaper by far)

[spoggy]

Originally Posted by Destroyer

I've always used hydraulic oil... (the type you use in hydraulic jacks) Never had a problem with it, but now that I know about 10w-30 I think I'll start using that. (cheaper by far)

I know that motor oil allows for the suspension of water within the oil. When the oil temperature rises above 212 F, the water "boils" off and exits through the vent in the valve cover (in a combustion engine). Hydraulic fluid doesn't allow for this, and generally allows for the collection of water, either in a filter or the bottom of a sump.
I would have concerns using motor oil in a system that never gets hot enough to remove the water in suspension.
Just my $.02