I don't think it's really the RPMs that make a boat engine wear different than a car it's the constant load. It only takes a fraction of your engines power to push your car down the highway but it takes a ton of power to just keep your boat on plane.
Compare how far your boat coasts to your car. That gives you an idea how much harder the boat engine is ALWAYS working.
I agree the oil looks almost new when I change it in the fall too. It's a pretty clean environment your boat runs in....
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Originally Posted by lawn psycho
My boat planes out at ~2800-2900 rpm and is where I spend most of my time driving it. I can't recall but am pretty sure I never even went WOT this year.
Changing the filter every year and the oil every other is probably a better plan of attack. I know that my oil after one season of use looks just about the same as it does coming out of the bottle. Not even close to being black.
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