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Coolant requirements on a replacement radiator

Hi Netters,
over the weekend my radiator in my '86 5000 CST broke its upper
hose connection. Because it was wet on the seam between the plastic
and copper for quite some time before, I decided for a replacement
radiator instead of trying the "pipefix".
Since Audi asked for $385 for an OEM and $4?? for a stock one
I went for an ALL copper replacement for $190.33.
Now my question, with an all copper radiator, can I now use
Prestone, Zerox, etc. instead of the spendy Autobahn coolant, or
are there other parts which don't like phosphate either?
- Hans

PS: The new Prestone bottle doesn't state whether it contains phosphate.
    Does anybody know?
 Hans-Joachim Tannenberger               //  PHONE: (503) 578-3781
 Sequent Computer Systems, Inc.         //   FAX:   (503) 578-5797
                                       //    Mail-Stop WIL2-786
 UUNET:       uunet!sequent!hans      //     15450 SW Koll Parkway
 INTERNET:    hans@sequent.com       //      Beaverton, Or. 97006-6063