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You unscrew the top plug on the lower unit and carefully unscrew the drain plug on the bottom and quickly put the nozzle end of the oil container in it and keep squeezing till the oil just starts to come out of the top hole. This runs any water and/or air out and guarantees that the gearbox is lubed properly.

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βˆ™ 13y ago
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Anonymous

Lvl 1
βˆ™ 3y ago
Something is keeping the lower screw from going back inΒ 

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Q: How do you fill outboard motor lower unit oil?
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Lower unit diagram 50 hp mercury?

How do I remove the lower unit from my 1984 50 hp. Mercury outboard motor?


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I use 80 weight gear oil.


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What kind of lower unit oil for Johnson outboard?

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