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5 Things to Do for Marine Engine in the Winter



boat maitenance

Different seasons and weather conditions may have different impacts on your preparations for boating. For most of the people boating season ends around Labor Day. So when it is winter, you need to pay special attention to engine maintenance so make sure it’s longevity. Many experts have written about boats and how to keep them in running in the best shape as long as possible.

In this article, we will share the top things to do to prevent OMC parts and other engine parts from any damage during the offseason.

Lubricate, Change Oil, and Add Antifreeze to Preserve Your Engine

The first thing that you need to do is “fogging”. Fogging is a process in which the oil is applied to the engine cylinders and pistons while keeping the engine running. They can be sprayed on carburetors, air intakes or through the fuel line. You also need to change the engine oil after you’ve fogged the engine. In the end, you need to pour biodegradable antifreeze through the cooling system to flush any water and to protect engine parts.


In order to find any corrosion, you need to inspect the aluminum sterndrive carefully. Galvanic action makes the Aluminum corrode. And we all know that corrosion is the enemy of marine engine parts. If you find signs of corrosion on the sacrificial anodes, the source of the corrosive element must be located and eliminated.

Remove and Store Drain Plus

It is very important to pull the engine drain plugs and store these where you’ll remember to retrieve them next Spring. You can remove any condensation by inserting a pipe cleaner and swirling to catch any drops that may have formed.

Spruce Up Gear Cases and Sterndrives

Inspect and find if the gear cases and sterndrive are scuffed. If you find so, you need to sand with 150-grit sandpaper, wipe down with white vinegar, then quickly apply the first of several coats of zinc primer. To keep the look of the boat you can color the topcoat to match your boat trim if you wish.

Protect the Engine Block

The engine is the most important yet vulnerable part of the boat. You need to take extra measures for its longevity. Regardless of the type of engine your boat has, it will need to be degreased. You can use paper towels to remove obvious globs, then wipe down with a soapy rag or sponge. In the end, spray the engine block, linkages, and wiring with silicone or any lubricant that dries to a waxy film.

Filler UP

The last thing you need to do is to locate the remote fluid reservoir for the gear case and upper drive and top off with fresh fluid. Another good thing is to put your craft into the dry dock with a full tank of gas. Most of the boat owners prefer to trailer with an empty gas tank, but it is better to have a full tank as it prevents condensation to form, which is a leading cause of engine failure.

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