> I've been searching through the archives, but i still can't get a handle
on
> a simple thing.
> My VW mechanic told me recently that i can buy any coolant and just mix it
> with %50 water. He usually uses a green kind. Didn't mention anything
about
> Phosphate free.  Am i missing something?

Yes. You are missing having a good Vanagon mechanic.
Phosphate free only! Don't worry about color... but must be phosphate free.