Winterizing R25 150 Yanmar-How much is enough

[SEEKER]

I'm winterizing my engine today and put about 2.5 gallons of RV antifreeze into the engine via strainer as recommend. When I did this last year I can't remember how much I used, just waited to see some antifreeze come out the exhaust, now I wonder how much really is enough? Any suggestions?

 

[knotflying]

That is about what I have used in the past and had no issues. It will be interesting to see what other opinion are out there.

 

[Osprey]

For the 180HP the mechanic at my dealer suggested 4 gallons.

 

[Kenny Marrs]

As long as the engine seacock is shut 2.5 gallons should be enough.

-Kenny