I know alot of the other gm products had issues with dex-cool but i haven't seen or heard of problems with it in the duramax. I do know that if you send a sample for analysis, they will usually say it is not suitable for use in a diesel engine. other than that has anyone had or heard of any problems as long as the tank cap is good and the level is cept up.

thanks
-Jason

And you don't overheat it to bad your ok.