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i would go with the recommended oil (80W90) just because it states that you should use that gear oil,i like to think that if it dont matter what you use when it comes to engine/tranny oil it wont tell you what specifically to use....in this case it asks for 80w90 use it!
I agree always use the proper lubricant.
The reason I ask is according to the Mercruiser manual the outdrive takes 80W90.
So if this fluid works in the outdrive it should work in other components that also require 80W90.
My only hesitation is that the bottle does not state its viscosity.