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Mercury 90hp 6 cylinder outboard 2 stroke before you take this too water you are going to change the spark plugs is there any oil which requires changing gear oil if so what type thanks?
Wiki User
∙ 9y ago
Changing the plugs and the lower gear oil yearly is best. There are two flat head screw heads on the lower unit, an upper one for filling and a lower one for draining. Be sure to use marine grade lower unit oil not just regular gear oil.
Wiki User
∙ 9y ago
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