I have a 1998 Buick and I have the orange dex-cool in my car from the factory. It is supposed to be good for 5 years or 150,000 miles but at 70,000 I had to have my cooling system acid flushed because the orange stuff have failed. The coolant had congealed or something similar to that and my radiator was had rust and other crap floating around in it. Cost me $400 to perform the GM TSB specified fix for this. Buick reimbursed me for half that after I spent 4 months complaining. I also know that a group of GM car owners is trying to get together enough people to file a class action law suit because the orange dexcool caused the intake manifold gasket to deteriorate allowing coolant in oil and oil in coolant. I have friends with a fairly new GMC Envoy (less than one year old) who had their radiator checked after I told them about my problems and they were told the orange stuff was already beginning to gunk up or jelly or congeal or whatever.

I am done with GM and their orange coolant as soon as my extended warranty (didn't cover coolant issue) expires.