Winterizing antifreeze question

Discussion in 'General Discussion' started by mnm99, Sep 25, 2022.

  1. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    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.
     
  3. GypsmJim

    GypsmJim Well-Known Member

    827
    Aug 8, 2018
    Western New York
    '19 SPX 190 OB, 150 & 5 Mercs
    '17 Whaler 150 Montauk
    '15 Yamaha FXHO
    '60 Mulray Dinghy
    '52 Lyman 15'
    Mercury 150 4-stroke
    68 Outboards representing 11 manufacturers
    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.
     
  4. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    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
     
    Last edited: Sep 26, 2022
  5. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    Twin 8.1 V-drives
    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
     
    SKybolt and Shaps like this.
  6. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    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).
     
  7. mrsrobinson

    mrsrobinson Well-Known Member SILVER Sponsor

    Mar 9, 2006
    Virginia, USA
    2001 Sea Ray 380DA
    3126 purring CATs
    I always used the ethanol based in my gas engines. It's in there 3 months, never had an issue.
     
  8. highslice

    highslice Well-Known Member GOLD Sponsor

    Mar 28, 2008
    Table Rock Lake, Hollister Missouri
    270 SLX
    2013 Sea Doo 155 Wake
    496 Mag
    Bravo III
    Corsa
    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.
     
  9. GypsmJim

    GypsmJim Well-Known Member

    827
    Aug 8, 2018
    Western New York
    '19 SPX 190 OB, 150 & 5 Mercs
    '17 Whaler 150 Montauk
    '15 Yamaha FXHO
    '60 Mulray Dinghy
    '52 Lyman 15'
    Mercury 150 4-stroke
    68 Outboards representing 11 manufacturers
    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.
     
  10. mrsrobinson

    mrsrobinson Well-Known Member SILVER Sponsor

    Mar 9, 2006
    Virginia, USA
    2001 Sea Ray 380DA
    3126 purring CATs
    Well, I didn't know any better, I thought pink antifreeze was Pink antifreeze, so I guess I got lucky
     
    highslice likes this.
  11. SKybolt

    SKybolt Well-Known Member SILVER Sponsor

    Nov 11, 2014
    Kent Narrows, MD
    460 EC
    Detroit 6v92TA
    (Low profile's)
    Alison Gears
    Westerbeke
    12.5kw Genset
    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.
     
  12. highslice

    highslice Well-Known Member GOLD Sponsor

    Mar 28, 2008
    Table Rock Lake, Hollister Missouri
    270 SLX
    2013 Sea Doo 155 Wake
    496 Mag
    Bravo III
    Corsa
    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.
     
  13. SKybolt

    SKybolt Well-Known Member SILVER Sponsor

    Nov 11, 2014
    Kent Narrows, MD
    460 EC
    Detroit 6v92TA
    (Low profile's)
    Alison Gears
    Westerbeke
    12.5kw Genset

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