Re: Frequency of Changing Oil & Fuel Filters
The reason that oil change recommendations have both time and hours, is because they degrade on both schedules, independently. Obviously, the more you use the oil, the more contaminants are introduced that can and will eat at your motor. However, fresh oil has chemicals that degrade or evaporate over time, whether you run the motor or not. Those chemicals are also there to prevent corrosion.
I change oil at the beginning of the season and end, and once more if I hit 100hr of use mid-season. I do add fresh oil just before hauling and change it again when I launch, even though it essentially has zero hours on it. Sitting there for five months is bad enough.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.