And the reality is, raw water cooled inboards where the drain plugs are way down low is just always a risk here. Bad way to save money. The better way to run one would be at least a half closed system with both an easy to drain heat exchanger and exhaust. Pressurized coolant with antifreeze is just superior. Yes when I repower mine I will gladly pay the $2,200 for that. Anybody who’s had one of these and struggled getting at those plugs on a V6 or V8 knows what I’m talking about!!!
Because of the heat exchanger you could even use the suck up the AF via the outdrive (using a pump to augment flow) for winterizing and be done with this chore in 10-15 min!
Merc’s quick drain is another type of denial, yeah they work for a few years and then they don’t. Because of how cast iron corrodes! Flakes clog drains!