Joy, the Zerex I have encountered people using is not the Dex-Cool formulation , but rather one called G0-5:  http://www.valvoline.com/products/brands/zerex/antifreeze/42

I have read, but have no knowledge beyond rumor, that it is sold by Daimler under its Mercedes brand for Mercedes vehicles.

For what it's worth, a radiator shop owner recommended to me not using Dex-Cool formulations, regardless of brand, because of gelling problems.  I have no idea if he was correct.

I have no connection with Zerex or Valvoline.  Yes, Zerex is a Valvoline brand.

mcneely

---- Joy Hecht <jhecht@ALUM.MIT.EDU> wrote:
> The "dex-cool" type is what my mechanic recommended - he said it didn't
> matter which brand.  Zerex seems to be a brand name for Valvoline, applied
> to a number of different products.  Any idea whether people are using all
> Zerex products, or just the "Dex-cool" variant?
>
>
>
> Joy
>
>
>
> On Mon, Dec 19, 2011 at 4:02 PM, <mcneely4@cox.net> wrote:
>
> > Joy, this is reported to be available in Canada, and it is phosphate free.
> >  Whether it is equivalent to VW blue antifreeze, I could not say, but I do
> > know that some vanagon owners use it.  If the only criterion is phosphate
> > free, this should make the grade:
> >
> > http://www.valvoline.com/products/brands/zerex/
> >
> > mcneely
> >
> > ---- Joy Hecht <jhecht@ALUM.MIT.EDU> wrote:
> > > It appears that it's no longer possible to buy phosphate-free coolant, at
> > > least in Canada.  VW no longer carries it.  They say that their "aluminum
> > > core compatible" coolant is a suitable replacement.  My mechanic said
> > > something similar.
> > >
> > > What do folks here think?
> > >
> > >
> > >
> > > Joy
> >
> > --
> > David McNeely
> >

--
David McNeely