1GM10 winterizing

May 16, 2007
1,509
Boatless ! 26 Ottawa, Ontario
I'm winterizing a 1GM10 (no fresh water cooling) and thinking 2 gallons should be good. How does that sound ? This is in Canada so it needs to be full strength !
Bob
 
Aug 13, 2012
533
Catalina 270 Ottawa
sounds marginal.

The only sure way to check is to catch what is coming out of the exhaust and verify that it is full strength.

I use about 20 l (5 small containers from The Chandlery) to make sure.
 
Last edited:
Jul 1, 2010
990
Catalina 350 Port Huron
The trick is making sure the thermostat was open when you flushed the antifreeze through. If in doubt, open the block drain and just drain the block.