I have a stupid question about winterizing an outboard
I have a new-to-me boat with a Yamaha 300 HPDI outboard on it. Everywhere I've seen (including the manual) says to winterize it I just need to drain it, keep the motor lowered, and oil the cylinders a bit (on top of changing filters and adding stabilizer, etc.).
However my friend who knows MUCH more about boating than I do insists that I should run it with muffs and a hose running to some antifreeze to get it in the engine and behind the thermostat, because there's no way to drain the water that might still be in the engine and it could freeze and crack something (I live in new england).
So someone give me a sanity check - does anyone actually run antifreeze into their outboard to winterize it from below freezing temps? And how would one even do that without spewing antifreeze ALL over the place?