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Winterize recommendations

PullhardPullhard Posts: 48 Baller
Looking for basic winterize recommendations for my 1998 Mastercraft Prostar 205 with the Chev. LT1 Aluminum Head engine. Boat is stored outside and is located in the Pacific NW. We get some cold temperatures below freezing occasionally from November through February. Just looking for some recommendations for a basic winterize. Also, believe this engine has a closed cooling system so is there anything special to do with that? Thank you.....


  • rbuss4rbuss4 Posts: 21 Baller
    Not a closed cooling system unless it has the salt water package. Check the Mastercraft TeamTalk Forum for great "how-to" winterization tips and feedback
  • jimskijimski Posts: 588 Crazy Baller
    Fill a 5 gall pail up with RV antifreeze. Pull the fresh water pick up hose off and suck up the antifreeze until it blows out the exhaust.
    Run the motor up to temperature first.
    Is there a heater in the boat. Find out if it’s hooked up to the closed cooling system.
  • PullhardPullhard Posts: 48 Baller
    Is there any concern the antifreeze can damage the aluminum heads?
  • Ski_DadSki_Dad Posts: 480 Baller
    if not closed cooled, drain both block drains and the manifolds (use a small screw driver to make sure no rust is built up in the holes) then you can add pink antifreeze. I like to find the stuff with propylene glycol as it's better than the Ethyl Alcohol/Ethanol stuff. if you have a heater or shower you need to blow those lines out with air.

    if you really have closed cooling then you don't drain the block, you just drain the heat exchanger, tranny cooler and manifolds and then you can add a few gallons of pink antifreeze (if desired)
  • A_BA_B Posts: 4,296 Mega Baller
    If it was a Nautique, I would recommend draining the entire cooling system and refill with 50/50 antifreeze.

    But for a MasterCraft, I would just leave it sit outside then convince the wife I need a new Natuique next summer.... :open_mouth:
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