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Water in mufflers.

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While doing winterization, I shop vac my mufflers to get any residual water out of them. I just push the vacuums hose up thru the exhaust on the transom. I normally get a quart of water out of each muffler. It would be more, but I climb a steep driveway which drains a lot out. Just a heads up for folks who store in cold places.  

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Marine antifreeze…from the interweb:

What is the difference between marine vs auto antifreeze? Marine antifreeze is non-toxic and often contains rust and corrosion inhibitors that protect your engine during the winter. In contrast, auto antifreeze is designed to be used both as antifreeze and coolant for your car engine and can be extremely toxic and environmentally damaging. Car antifreeze should never be used in a boat engine.

I forget the brand I use, but here are some reviews.


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