Join Date: Feb 2010
Location: Narragansett Bay
Thanked 594 Times in 570 Posts
Rep Power: 12
Re: Transmission Oil
I wonder if the prior owner just used the same motor oil they used in the engine. eg 15w40, which would seem much thinner. If so, I would just put the right stuff in and monitor, I doubt it would destroy the gear.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.