Inboard engine winterization

I know that my exhaust has places where water lies, water trap, muffler, gearbox cooling etc. Once ashore, I run the engine with a temporary fresh water supply to flush any salt out of the system, to cut down on corrosion, and just before stopping the engine, I introduce antifreeze into it, partly as a corrosion inhibitor, and partly to stop any of the trapped water freezing, and possibly causing damage. I consider the cost of 5 litres of antifreeze to be a well spent insurance premium.

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