I am needing advice about the gear case oil and changing it in the lower end of a Johnson Sea Horse AD-11. I have seen several examples of this being done. But I don't really know which is the correct procedure. I have seen the oil being filled from the top and also from the bottom using a pump to pump the oil into the gear case. I just got the motor and the previous owner said that he had used it down in Florida in the salt water, so I want to change out the oil before I try to start it up for my first time. This is my first outboard motor and am really nervous about messing it up. I understand that I am suppose to use Marine grade 90 weight oil in it as well. I am just wondering if it has to be marine grade or if the regular Pennzoil 90 weight oil will be good enough. Any help in this will be greatly appreciated.
