Why Winterizing Matters
Improper winterization is the single most expensive mistake a boat owner makes. Cracked engine blocks, corroded fuel systems, and seized through-hulls can turn a routine winter into a $5,000β$15,000 repair bill in the spring.
The good news: done correctly, winterization is straightforward.
The Checklist
Engine
Change engine oil and filter while warmFlush raw water cooling system with fresh waterRun antifreeze through raw water circuit until pink at exhaustFog all cylinders and carburetor with fogging oilRemove spark plugs, spray fogging oil, reinstallDisconnect battery or connect to trickle chargerFuel System
Fill tank to 95% capacity (prevents condensation)Add fuel stabilizer β run engine 10 minutes to distributeInspect fuel lines for cracks or softnessClose fuel shut-off valveCooling System
Drain freshwater cooling system if equippedCheck hoses and clamps for wearInspect heat exchanger zincsHull and Drive
Inspect anodes (zincs) β replace if less than 50% remainingLubricate steering cable and helmGrease propeller shaftIf trailered, chock the trailer and store propellerInterior
Remove all food, cushions, and electronicsLeave cabin hatches cracked for ventilationCover bilge with bilge antifreezeWhen to Call a Pro
If your engine is exhibiting unusual smoke, the impeller hasn't been changed since 2 seasons ago, or you've had overheating issues during the season, winterization is an excellent time to have a professional assessment.
Check Boatee for rated marine mechanics in your area with community pricing β before you call.