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Winterizing my 07 SANTE 220 ZR6. Block is closed cooling but I had a question regarding the rest of the system. I always go ahead and drain the system (Vdrive, manifolds, and heat exchanger) using the optional drain kit that the boat has. Following this I always suck around 5 gallons of antifreeze into system then check plugs to be sure system is full of coolant. Never really paid much attention to it but notice the prop shaft seal let’s a lot of the water/coolant out and noticed manifolds have no water in them after sitting (this was before winterizing). Any ideas?
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