Mix Proylene and Ethylene?

[carock]

What happens if you mix propylene glycol and ethylene glycol coolants? I hear it is bad.

 

[bruce381]

why? other than PG is not as good as EG for freeze protection but PG is also not Toxic for kids and birdies.
bruce

 

[labman]

What happens if you mix 2 different grades of ethylene glycol? I just checked the label on the Prestone Low Tox I have on hand. It says nothing about being careful not to mix with ethylene glycol. I don't know what it is comparable to, I suppose the plain old yellow jug Prestone.

I do feel that when I soon dump the Dex-Cool that came in my 02 Cavalier, that I do several drain/flush cycles to remove the last trace of Dex-Cool before adding Low Tox or any non Dex-Cool.

Remember when all there was was permanent antifreeze and the alcohol that boiled away?

 

[TallPaul]

Isn't PG the stuff they put in ice cream to keep it from being too hard to scoop?

 

[labman]

Propylene glycol has a wide range of uses, both as a food additive and as an anifreeze.

 

[oilboy123]

Conventional wisdom is they do react. I had a shop put a radiator in my dads old dodge van.
I told them not to top off with EG. It had the old Amsoil PG formula.

They did and I could see the reaction after a couple of months. The new Amsoil PG says it is compatible with just about anything. It's what
I run now.
I would not add the two together unless one of them says it's compatible. Even then keep an eye on the system.

 

[bruce381]

PG and EG are compatible BUT the problem is the other additives used in the finished fluid.
bruce