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You don't put motor oil in a lower unit. Get a few tubes of lower unitgear lube from a marine supply dealer and a device to squirt it in. Remove the screws at the top and the bottom. Drain the old lube out. squeeze the new lube in from the bottom till it comes out the top, then re install the screws. Do this at the end of every boating season.

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Q: What weight oil goes in the lower unit of a mercury outboard?
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