R/v anti freeze

[i_am_am]

Living in NC, the winter's are'nt as harsh as some of the MN and northern areas. I keep my 99 SAN hanging in the boathouse at the lake. If I look at all the HUNDREDS of boats hanging up around the lake, and if everybody winterizes with green AF, that's alot of toxics for the fish. I decided to use Starbrite's AF. I have used pink rv, low-tox, and green. I want to protect my lake. Here's a link.

http://starbrite.com/productdetail.c...G%20Antifreeze

Reading the fine print on af non-automotive af's is scary. Almost decieving when you see big letters -100 deg. One of the good things listed on the Starbrite is that it is designed for engines. It has corrosion protection also. I just want to find some local so I don't have to order it.

[gtxragtop]

Do I need to put antifreeze into the raw-water/seawater section of the cooling system after draining?

MerCruiser requires the use of propylene glycol antifreeze (with a rust inhibitor for marine engines) in the seawater section of the cooling system. Damage caused by freezing or improper winterization is not covered by the limited factory warranty.
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Can I use propylene glycol (RV antifreeze) in my engine?

Propylene glycol antifreeze with a rust inhibitor is approved for use in the raw water cooling system for cold weather storage purposes ONLY. However, if your engine is equipped with a closed cooling system, you should always use a 50/50 mixture of ethylene glycol antifreeze and water in this system. Even if you don't live in a freezing climate, you should still use an antifreeze/water mixture rather than plain water. Antifreeze mixtures have superior anti-corrosion and boil over protection properties.

[gtxragtop]

The pink antifreeze is NOT ethylene glycol.
Ethylene glycol is the green "Prestone" auto antifreeze.

Correct. It is Propylene Glycol. See http://www.homedepot.com/catalog/pdf...df5e792462.pdf

[gride]

Use pink dex 50/50 in my closed cooling system. Green can get jellylike.