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Improper winterization isn’t just a seasonal chore—done poorly, it can result in thousands of dollars in repairs. Below are the most common mistakes and how to prevent them with straightforward maintenance actions.
The mistake: Storing the boat for months with untreated fuel.
Why it’s costly: Gasoline degrades, forms varnish, and moisture can contaminate the system—leading to clogged carburetors/injectors and hard starts in spring.
How to avoid it: Add a marine-grade fuel stabilizer before storage and run the engine so stabilized fuel reaches the entire system. For diesel, consider biocide additives to prevent microbial growth.
The mistake: Leaving used oil and filters in place over the off-season.
Why it’s costly: Used oil contains acids and contaminants that can corrode internal components during storage. Neglected gear oil in the lower unit can also lead to wear and water intrusion issues.
How to avoid it: Change engine oil and filter at the end of the season; replace lower unit gear oil on outboards and sterndrives. Inspect sealing washers and gaskets to prevent leaks.
The mistake: Skipping freshwater flushing or antifreeze circulation (where freezing is a risk).
Why it’s costly: Salt, silt, and mineral deposits remain in passages and can corrode parts. In freezing climates, residual water can expand and crack components.
How to avoid it: Flush with fresh water. In freezing regions, circulate marine antifreeze through the cooling system. Inspect and replace the water pump impeller and thermostat if due.
The mistake: Overlooking sacrificial anode wear or using the wrong material for local waters.
Why it’s costly: Exhausted or incorrect anodes expose gearcases, props, and other metals to galvanic corrosion.
How to avoid it: Inspect and replace anodes each season. Material guidance: Zinc for saltwater, Aluminum for brackish/salt (broad coverage), Magnesium for freshwater only. Apply protective sprays/greases on exposed metal as needed.
The mistake: Storing the boat with batteries connected and unmaintained.
Why it’s costly: Lead-acid batteries self-discharge and can suffer permanent damage if left depleted. Electrical connections may corrode in damp storage environments.
How to avoid it: Disconnect batteries, clean terminals, and store in a cool, dry place. Use a smart charger/maintainer to keep batteries within optimal state of charge.
Conclusion:Prevention costs less than repair. A seized engine can run $5,000–$15,000, while proper winterization supplies typically cost a fraction of that.