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Stick with the engine manufacturers instructions & you will be ok,,I don't know of any that call for antifreeze in an OB,,outboards are self draining when properly stored, anything in the cooling system will drain out of the motor
 

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If you do want to run antifreeze thru your motor just for piece of mind dont use the Car antifreeze, use the -50 or -100 marine/rv antifreeze. Prestone green antifreeze is not bio-degradable. Before you put antifreeze in its more important to run a good fuel stabilizer through the fuel system and add a little bit of fog to the system to help protect the fuel pump(s) and the injectors plus the cylinders.:D
 
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