What are some tips for winterizing a boat engine?


Quick Answer

Winterizing a boat engine requires replacing the fuel, engine oil, drivetrain oil and antifreeze, as well as fogging the engine and storing the battery in a safe storage area. Start by emptying the fuel tank of old fuel then refilling it to almost capacity, leaving some room for the fuel to expand. Add a stabilizer to the fuel to prevent it from degrading over the winter.

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Full Answer

Use a manual or electric oil changing system to drain the engine oil, then replace it with new oil that adheres to manufacturer specifications. Replace the oil filter and drivetrain oil as well.

Drain the engine of water and replace it with marine engine grade antifreeze, which can be -60 or -100 degrees. Do not dilute the antifreeze with water. Make sure to run the engine for a few minutes before draining it of water and pouring in antifreeze.

After putting in the replacement fuel, engine oil, drivetrain oil and antifreeze, run the engine for a few minutes to allow the new fluids to circulate through the engine system.

Fog the engine by spraying some fogging oil into the carburetor while the engine is running or through the spark plug holes when the engine is turned over. Refer to the boat's owner's manual to confirm which method is best for the engine. If information is not available in the manual, ask a mechanic or consult the manufacturer.

Remove the battery from the boat and store in a safe dry place for the winter. Keep charging and adding distilled water to the battery sporadically while not in use.

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