Re: lower end gear oil
Make sure you get gear oil that's desined for outboard lower units. Any brand will work, just get a quality name brand. As for draining the old oil, take out the upper and lower screws and catch the old oil in a can. When you put the new oil in, let some run straight through so it will rinse out any sludge. You will need two new seals for the drain/fill screws.