Join Date: Feb 2010
Location: Narragansett Bay
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Re: How often to change outboard motor oil?
I would warm it up a bit more, let her idle while you're getting ready.
Does your boat come out of the water at all? I change the oil in the 18hp dinghy motor at the beginning and end of each season. Yes, I change it at the beginning, even though it hasn't run since I changed it in the Fall. Engine oil has protectants that degrade just sitting there.
I suppose it would be better to do a mid-season change too, but nearly impossible, without hauling the dinghy.
Search online for the operators manual, if you don't have it. They will be fairly specific about time and hours between changes.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.