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Old 10-24-2013, 09:01 AM
CruisinGA's Avatar
CruisinGA CruisinGA is online now
MC Devotee
Join Date: Jun 2009
Boat: '01 X9 330HP
Location: Georgia
Posts: 2,338
I may be in the minority but I do not run my engine to winterize. There is no water at my storage/winterizing location and I do not like having to 'trust' that the engine is warm enough for the thermostat to be open and allow antifreeze into the engine.

I drain the block and manifolds as you have (which alone should be enough), and then remove the thermostat housing and pour in RV antifreeze until it comes out of the block drains. RV antifreeze (propylene glycol) is more dense than water, so it should displace any water remaining in low spots within the block.
I then button it back up so that in the spring all I do is install a new impeller and drop the boat in the water. This method does require that I buy a $2 thermostat housing gasket every year.
'02 X-9
Lake Blue Ridge
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