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RE: S Car antifreeze



Is there more to the pentosin antifreeze than just being phosphate free ?
I have some Prestone orange antifreeze which says it is phosphate free and mixes with regular green stuff, (unlike the other extended drain stuff) I have mixed it with the green stuff and so far no goo or gel in the coolant. Does anyone have any experience with this product? how does it compare the pentosin? I have been using regular prestone in all of my Audi's for 7 years and never had any problems, was wondering if it was worth switching to the expensive and hard to find stuff, especially considering I flush the coolant at least once a year. 
Thanks
Mike Guidotti
PS any word on the driver event in Georgia with the Porsche club? I went to the one in 97 and it was great!!!, anyone planning on going??