www.iFourWinns.com

The Mercruiser Manual for my engine instructs to drain the system. Then it states "For additional assurance against freezing and rust, fill the cooling system with a solution of permanent antifreeze and water."
Basically the antifreeze gives me a warm fuzzy feeling that all is good!
I do drain only myself when I am still using the boat and the temps are near or below freezing at night. I only pull out the antifreeze when I'm tucking her in for the winter.

_________________
-Andrew

1984 Four Winns 225 Sundowner
5.0L Mercruiser, Alpha 1

If you drain properly (make sure you look in the manual for your engine so you don't miss any drain points) + probe all the holes to make sure they drain it should be fine. I do add the AF because it takes the place of air which is what causes corrosion. Fe02=Iron oxide/rust, no 02 less chance of rust..

_________________
88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

my dad ended up having an issue from heated winter storage, of corrosion, which eventually ate through the headgasket causing engine failure on his 245 Sundowner.

For the 45 minutes of work it took, it was well worth the effort.

_________________
Rob

Present: 1999 Formula 280SS
Past: 1989 180 Horizon

http://www.robcamerondesign.com

If I could make my 88 last this long being moored in salt water 6 months our of the year never flushed till the end of season at least 15 years worth by filling with the RIGHT AF (-100) I think I can say it works!!

_________________
88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II