Join Date: Feb 2010
Location: Narragansett Bay
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Re: changing oil
Oil is not just a lubricant. It has additives that are intended to prevent corrosion, deal with moisture, slow it from shedding off critical parts while sitting idle, etc.
Some of these additives will decay or evaporate or whatever, just by sitting in your motor. That's why oil change dates are given in both calendar (months) and usage intervals (hours, miles, etc).
I put fresh oil in just before laying up for the winter, so I have max additives for the winter. Then I replace it at the beginning of the season, even though I have run the motor more than 30 mins. Sitting for 5 months will degrade the oil's full usefulness.
Fresh oil is the cheapest maintenance one can do to prolong engine life. I only change the filter once per year.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.