I've got a 02 90 hp. It's relatively new to me. After some diagnotics I think I have some air in the system. I want to top off the fluid but I don't know what is in there. I've read that many use ATF to fill it, but I wanted to verify that is not an issue to mix that with whatever is in there?
What do you all do if you have to top it off but don't know what was used in the past?
What do you all do if you have to top it off but don't know what was used in the past?