Re: Lower unit on 1992 Johnson-Help
Milky lower oil means you have a leaking seal somewhere that is letting water into the lower, you caught it in time and it is fairly easy to fix.
I would order a factory OMC manual first(NOT Seloc-Clymers or any CD), either here at iboats or on Ebay and get a lower unit seal kit, iboats should have that too then get to work, may as well change your water pump too while you are in there.
I normally check my lower oil every other trip by just cracking the bottom plug, oil comes out I am good, water comes out and I know I have a problem.