I had dexcool in my Z-34 and sold it with 275K on it. No issues, My olds had 180K or so with no issues and my GTP with 110K has no issues. I hear a lot of bad about dexcool but personaly I have had no ill effects or bad experiences with it. I maintain my system, I dont add crazy quick fix BS in a bottle, I throw out original caps and run SLANT Lev-R-Vent caps, and I buy good thermostats. Result = no issues and my cars with dex run cooler than any car I've owned with the green stuff.