Winterizing antifreeze question

Just to be clear (so I fully understand)... your ENGINE is closed-cooled, but your manifolds are open, right? In other words, the engine side of things is not factored into this in any way? If that stuff has propylene glycol as the main ingredient and NOT ethanol, then yes it is fine to use.
 
I would use that in the potable water systems in my RV or boat. That's all. There are 2 kinds of PG anti-freeze. The one you should use is the one that didn't merely say "RV / Marine", but said specifically for engines. Its the more expensive of the 2 versions.
 
Just to be clear (so I fully understand)... your ENGINE is closed-cooled, but your manifolds are open, right? In other words, the engine side of things is not factored into this in any way? If that stuff has propylene glycol as the main ingredient and NOT ethanol, then yes it is fine to use.
Yes its closed cooled. Looks like it's main ingredient IS ethanol. I won't use it, but what is the reason? Thanks

Page 2- https://prestone.com/wp-content/uploads/2020/11/SDS834-1.pdf

I also have this stuff laying around that has both.
http://southwinltd.com/sds-request/#gallery-26
 
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Does anyone know if this Prestone can be used in a closed cooling engine? Just for the Raw water side as a winterizer? Just manifolds and coolers, not in the engine? It does say not for engines, but it's not going IN the engine.

https://prestone.com/product/prestone-rv-waterline-antifreeze/

That would be fine to do your raw water side. The "not for engines" disclaimer is intended for people thinking about putting it in their radiator.

Personally I just get the "Pink" AF from Walmart.

-Kevin
 
Yes its closed cooled. Looks like it's main ingredient IS ethanol. I won't use it, but what is the reason?
The ethanol-based stuff does not have the corrosion inhibitors in it that the PG stuff has. Ethanol-based stuff can actually CAUSE some rusting in the engine (or manifolds in your case).
 
I always used the ethanol based in my gas engines. It's in there 3 months, never had an issue.
 
Braver man than I am. I don't want anything "ethanol" near my boat. I only use propylene glycol pink. Relatively cheap at WM. It has worked for 15 years.
Get a "little" water in your gas tank, and it goes to the bottom of the tank and now you're stuck. Seen it happen on cars years ago.

So, where is your boat? IT'S IN THE WATER!!!

E10 is an advantage because it combines with the water and flushes it right thru. Easy, peasy, no mess, no fuss. Now if you get a "lot" of water, you're screwed either way.

I won't use anything but ethanol gas in my boat. PG anti is another story. Buy ya need to read the SDS to be sure.
 
Winterizing the raw water side of your engine(s), that is fine, but as mentioned do not use it anti freeze for the closed loop side or in a radiator.
 
Get a "little" water in your gas tank, and it goes to the bottom of the tank and now you're stuck. Seen it happen on cars years ago.

So, where is your boat? IT'S IN THE WATER!!!

E10 is an advantage because it combines with the water and flushes it right thru. Easy, peasy, no mess, no fuss. Now if you get a "lot" of water, you're screwed either way.

I won't use anything but ethanol gas in my boat. PG anti is another story. Buy ya need to read the SDS to be sure.
Actually, my boat lives in a high and dry. It's only in the water when I'm using it. The marina I buy my gas from only sells non-ethanol premium gas with Valvtect. Never had a problem. I treat the fuel with Stabil 360 for the winter.
 

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