Coolant question

[Mark L. Chang]

It's an old old thread, I know. And I've searched the archives for info,
but I'd like the "final" word, if there is one.

Car is 91 90q20v... I've got a bottle of Prestone 5/150 that claims to be
phosphate and silicate free and can be added to any coolant.

The turn-to-jello-and-make-your-car-bad problem is mixing Dex Cool with
regular antifreeze, right? Adding phosphates and silicates to a
non-phosphated and non-silicated system may add corrosion to the aluminum
radiators and fittings and possibly wasser pumps.

So, I think that logic says I can add this Phosphate stuff to my NON
Dexcool system and voila, be okay.

Thoughts?

--
I live in that solitude which is painful in youth, but delicious in the
years of maturity.
   - Albert Einstein