First thing I do is drain the lake water out of my engine. Then I start it up while pumping RV antifreeze to the water inlet on the out drive. It will take in about 2.5 gallons by the time the thermostat opens and starts to spew antifreeze out the exhaust. I hit the carb with fogging oil and I'm done.
I leave the block full of antifreeze during winter.
Takes about 30 minutes.
Dont know if this is the right way or not, but I never have and problems...so it must be working! (knocking on wood!)
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