Re: C- Drive oil
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Either will work.
Amel changed the spec from 10-40 to 80-90 gear oil about 6 or 7 years ago. I found out about it when we were in Martinique from Amel Martinique.
Logically, it should have been gear oil from the beginning because it is all gears just like the bow thruster lower unit or the lower unit on an outboard engine.