I have seen it personally in a 1.8T 20V engine.   Nasty, nasty nasty.
 Green (G11) and Pink (G12) mixed.  It corroded the head badly and blew the
head gasket.

Jason

On Mon, Jan 13, 2014 at 6:04 PM, Jim Felder <jim.felder@gmail.com> wrote:

> Careful. I've done a lot of research on coolant for my 2.0 new Beetle. You
> have to use G5 or above, and if you have any kind of "conventional" coolant
> in the system, you are supposed to go to some pretty extraordinary flushing
> to get the system clean. The so called "experts" in the newsgroups claim
> that if you mix the two, you get a gel and then the engine is cooked. Just
> what I heard.
>
> Jim
>
>
> On Mon, Jan 13, 2014 at 4:41 PM, SDF ( Scott Daniel Foss ) <
> scottdaniel@turbovans.com> wrote:
>
> > Pretty sure that's a 'Mixes with Anything' coolant.
> >
>