You've probably already resolved the coolant thing, but I had "Dean" at eEuroparts tell me that factory fill for my '03 was Dexcool. At the time I was going to change my coolant, it looked greenish brown. I didn't know at the time that the PO had dumped in a head gasket stop leak to mask the effects of an over-pressurized coolant system. I flushed out my system with distilled water about 4 times, then refilled with Dexcool 50/50. Other than flushing out all of the stop leak, leading to a more obvious head gasket leak, I didn't have any issues with the Dexcool. I will say, if you get any of the stuff on your paint, make sure to wash it off quickly, it will stain the paint inside of the engine compartment.
2003 Saab 9-5 Aero B235R
Sport Wagon 2.3T HO Manual