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Old 08-05-2013
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Re: Confused about which oil weight to use

I can remember having salt water cooled Chrysler Crowns and Royals in some of my old boats. Those engines lasted decades with salt water cooling. Of course, the castings were twice the thickness of modern motors and made from non-recycled cast iron. After quite a few years, they would usually succumb to graphitization, crystallization of the iron, induced by salt water electrolysis. A lot of the new power boat V8 automotive conversions are very thin castings. I can't imagine them lasting more than a couple of years if cooled with salt water. The nice thing about the little Yanmar diesels is that they are more like the old straight 4/6/8 blocks of the past.
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