RV antifreeze is cheap, but I've always wondered if you diluted the antifreeze with 25% or 30% water, at what temp would it begin to freeze, and fail to protect RV plumbing?Walmart's SuperTech RV antifreeze states it offers protection to -50F. For folks that live in warmer climates where winter temps never get below +10F, it may well be that a diluted concentration would still offer excellent protection.I think I may run an experiment in my home freezer...............

RV antifreeze is already mixed with usually de-ionized water and should be used straight from the jug. It will freeze at low enough temperatures, but the mixture does not expand to cause damage to fittings. Adding more water could upset that no expansion balance. I don't suggest risking it...

As you say, it is already cheap. Why risk it?

Let us know the results of your test. It probably already comes 50-50 so measure carefully and let us know.

Most of the RV plumbing antifreeze out there now is the cheaper alcohol based pink stuff with the flammable sticker on the jug. It says on the label that product will freeze, but will not expand. It says to be sure there is no water left in plumbing and do not dilute product with water because then it WILL expand when it freezes and damage plumbing.

Someone has WAYYYYYY too much time on their hands!

Diluted RV Antifreeze | Good Sam Community

Dutch_12078
Explorer II
Dec 09, 2020
RV antifreeze is already mixed with usually de-ionized water and should be used straight from the jug. It will freeze at low enough temperatures, but the mixture does not expand to cause damage to fittings. Adding more water could upset that no expansion balance. I don't suggest risking it...
BB_TX
Nomad
Dec 09, 2020
As you say, it is already cheap. Why risk it?
Flute_Man
Explorer
Dec 09, 2020
Let us know the results of your test. It probably already comes 50-50 so measure carefully and let us know.
Z-Peller
Explorer
Dec 09, 2020
Most of the RV plumbing antifreeze out there now is the cheaper alcohol based pink stuff with the flammable sticker on the jug. It says on the label that product will freeze, but will not expand. It says to be sure there is no water left in plumbing and do not dilute product with water because then it WILL expand when it freezes and damage plumbing.
Cummins12V98
Explorer III
Dec 09, 2020
Someone has WAYYYYYY too much time on their hands!
cavie
Explorer
Dec 09, 2020
You can afford an RV but you cant afford $2.50 per gal of anti-freeze? It only takes 2 gals to do most any RV.
craig7h
Nomad II
Dec 09, 2020
WHY!
ereed52
Explorer
Dec 09, 2020
RV Freeze Test

After I put in Anti Freeze the last thing I Do Is open all Valves and my Low Point drains.
fj12ryder
Explorer III
Dec 09, 2020
ereed52 wrote:
RV Freeze Test

After I put in Anti Freeze the last thing I Do Is open all Valves and my Low Point drains.
Sure would have been nice to have put the antifreeze in a container that showed the amount of expansion, if any, that occurred when the antifreeze froze. To me that's more important than when it freezes, since the expansion is what causes the problems.
dougrainer
Nomad
Dec 09, 2020
cavie wrote:
You can afford an RV but you cant afford $2.50 per gal of anti-freeze? It only takes 2 gals to do most any RV.

Bingo, 20 years ago when full body paint on a Class A was a $10k factory option, people would pay for it. Then scream bloody murder when we charged $75 to wire their TOAD to the New Motorhome. Go Figure:h Doug