Interesting that you can just drain the block on a small Mercruiser.
All of the big boats at the boat yard with full inboards always run anti freeze through the raw water side. No different what power.. Mercruiser,Marine Power,Crusader, Cummins,Cat,Detroit,Yanmar all done with anti freeze.
If I trusted draining the block and exchangers I could save a bunch of $$$. I run 9+ gallons thru each engine. Maybe it's done because of the protective qualities in the antifreeze?
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Regards Barry
1987 V20 (sold) :(
1996 23' Wellcraft
1991 V20 ;)
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