dexron 2
 

they say i can use dexron 2 atf
is there a differance between dexron 2 and dexron 3 to use for your power trim fluid 150 mercury out board 1988

I use 10W30 motor oil

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to answer your question each generation of dexron atf superseded the previous generations stating that it was safe to use in applications that called for the earlier version.....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....

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)

10 30 really in an out board power trim motor?
how would i get the atf fluid out

my problem is that i dont like to change anything that i have been using but when i come to this site i know with confidence that my wellcraft brothers will never steer me wrong so i am going to try 10w 30 if i can figure out how to reove the atf oil thats in there not cause i think if there is any left in there it would contaminate the oil that i put in i winterize the motor the same way fpr 18 years and do the same thing never change if it works why change

I've used ATF with no problems for years. Just do not use dex vi in it. Dex/merc fluid is fine. 5w30 is a much closer match to ATF/hydraulic oil when you look at the viscosity ratings of them.

10w30 is very thick compared to atf fluid but if you guys use it than im sure it must be good to use 5w30 is closer i think

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