-50 or -100 antifreeze?

[PartsMan]

Is -50 antifreeze good enough in the northeast??

[alswagg]

I beleive it is,  but  I always flush the system with Marine antifreeze and never leave it tight or full.  I use the antifreeze to remove any trace amounts of water, not as a substatute for the water.  Hence if there is nothing to expand no chance of freezing.  This is in the engines and water/waste systems.  Good luck  Al

[fmrosell]

I beleive it is,  but  I always flush the system with Marine antifreeze and never leave it tight or full.  I use the antifreeze to remove any trace amounts of water, not as a substatute for the water.  Hence if there is nothing to expand no chance of freezing.  This is in the engines and water/waste systems.  Good luck  Al

Al, do you drain the manifolds in closed cooled engines, even after flushing with antifreeze?

[PartsMan]

Al, do you drain the manifolds in closed cooled engines, even after flushing with antifreeze?

DIDO .... I have the air actuared system. I plan on draining the system and fill with antifreeze, leaving the drains open.

[Capt Ron]

I use -50 and I'm more north than you guys. Never had a problem. Just leave every sea cock, drain plug and tap open. Don't forget the shower sump and swim platform shower. You will be good to go.

[alswagg]

On most current closed cooled systems from Mercruiser,  the lower manifold is cooled by coolant/antifreeze.  The manifold does not need drained.  On some older models this is not the case, on these the manifold will need to be drained.  Al