I just obtained a new boat on a trade. I got a 1984 Larson senza. Has a 3.7 mercruiser in it. I don't know much about these i/o motors as I have never had one before. All my previous boating experience is with smaller outboard motors. I know I will need to winterize the motor also, which I will have questions about later I'm sure - but for now I am really wanting to know what all I can replace and update for a good overhaul and tuneup to make sure it's ready next spring. The motor seems to run pretty good without any flaws, but since I have never owned one before I need to know how to maintain it. Any help would be greatly appreciated. New filters or hoses or belt ? What all does everyone do to keep these motors good and running strong ?