Join Date: Feb 2010
Location: Narragansett Bay
Thanked 544 Times in 521 Posts
Rep Power: 11
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.