I'm going to be doing a coolant change soon on my '04 9-3SS. I did a search of past coolant threads and from what I read anything 2004 and up is dex-cool and 2003 and below used the G-05 coolant? The coolant currently in the reservoir is a reddish/orange coolant which I'm guessing is GM dex-cool. I just wanted to double check before buying. I'm either going to get Prestone Dex-Cool or Valvoline Zerex Dex-Cool, are theses fine to use in our engines?