I just fill them till it is level with the fill plug. Most use a light oil, called tilt/trim fluid, also I think it's the same as some steering fluids. Atf of most types should be fine. Why is it low? Does it leak?
I'm just not sure how much to buy. Guess I'll just get the 8 oz bottle of power trim/tilt fluid. It doesn't leak but one trip it didn't want to trim up under power. Then two trips after it worked fine. I figured I'd flush it for maintenance.
