What Does Alcohol Free Or Ethanol Based Antifreeze Mean When Winterizing Travel Trailer RV?
Published 10/20/2025
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Question:
I noticed one says “ethanol-based” and another says “glycerin-free.” Does that mean one has alcohol and one doesn’t?
asked by: Julie
Expert Reply:
You’ve got it right. The Prime Guard RV & Marine Antifreeze -50°F Burst Protection 6 pack # PG56ZR uses ethanol as part of its base fluid, while the Prime Guard Glycerin Free RV & Marine Antifreeze -50°F Burst Protection 6 pack # PG36ZR eliminates alcohol entirely. The glycerin-free formula is popular with folks who prefer a totally non-flammable, low-odor option. If you’ve ever noticed a slight alcohol smell after de-winterizing, switching to the glycerin-free version will solve that.
One other thing to note is that the ethanol/glycerin free option is going to do a better job of protecting seals and fittings over the long haul.
Which style have you used in the past, Julie?
Product Page this Question was Asked From
Prime Guard RV & Marine Antifreeze -50°F Burst Protection - Ethanol-Based - 1 Gal - 6 Jugs
- RV Fresh Water
- Winterize
- Antifreeze
- Prime Guard
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on RV Fresh Water
Tom
10/20/2025
If the glycerin-free one doesn’t have alcohol, does it still protect as well in freezing temps? I figured the alcohol was what kept it from freezing.