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Changing the lower-unit gearcase oil (also called gearcase lube) on your outboard or outdrive isn’t all that difficult
All you need is a screwdriver, a pan to catch the old oil, some paper towels or rags (lots if you’ve never done this before) and some fresh lower-unit oil. Check your engine’s maintenance manual for the exact type and amount of oil you’ll need, then buy an extra quart in case you spill some. (Note: Different manufacturers recommend specific types of oil for their engines, so make sure you get the right kind!) Ideally, the lower-unit oil should be changed at the end of the season, before winter layup. That’s so you can check to see if any water...