Antifreeze

[bobkatfly]

So after running antifreeze through an I/O, do you leave whatever is left in the engine or do you pull the lower drain plugs and let it all drain out? I've heard that leaving it in affords some corrosion protection. The marina's that experienced the bogus A/F must routinely leave it in for them to be worried enough to redo the boats. In the past years I've let it all drain but this year I left the plugs in after running it through.