Mercruiser antifreeze?

I need to change the hoses that run from my motor to my hot water tank. Those hoses are filled with antifreeze from the closed cooling system on my Mercruisers. Once I replace the hoses what is the best way to replace the antifreeze that is lost during the change? Does the system require a vacuum to be pulled in order to avoid any air pockets or can I just top off the reservoir after goes through a heat cycle? What antifreeze should be used Dexron or actual Mercruiser antifreeze at $32 a gallon?
Comments
Not sure on your set up but the coolant cap is the highest point in my cooling system so no real bleeding needed. Just fill, run for a few minutes. For kicks I'll check it after each of the next few runs.
I suppose you could pull a vacuum to fill but seems like too much work. I've not seen a complicated expansion tank on a boat, just simple overflow bottles.
The dex orangish is really common factory coolant for GM V8 engines. There were some issues when it first came out and lawsuits tied to it. In the land Rover world they traded it out to the old school green due to it eating head gaskets. Said land rover engines were all aluminum engines that were built from buick design
Those issues have been rectified.
That Prestone DexCool would be fine. If it's harder to find in the states, I use Peak Orange Dexcool on my Rotax engine in the scarab as it also calls for GM, same stuff.