First of all, I am embarrassed to say that I didn't know there were two different types of radiator coolant. (Seriously, that's like not knowing that there two different types of engine oil. ) Anyway, the engine apparently had Dexcool in it when the top radiator hose blew off while stopped at a red light in downtown Detroit on our way to a Detroit Lions game. We got it pulled over fairly quickly and shut it down. No permanent damage done fortunately. We got the hose reattached and, after the game, stopped at a gas station between the stadium and car and bought some green coolant (two gallons) and put it in just to get the car home, which we did. Fast forward: the car has a new radiator and has had several gallons more of green coolant added to it, to the point where it's pretty much made a complete changeover from Dexcool to green. The overflow tank was also drained. (I still have to flush/burp the heater core.) Here's my question: first of all, I know that you cannot mix the two. I also know that Dexcool has had problems when air gets into the system. I would like to just stay with the green. Is this going to cause problems in the long run, especially given that the engine previously had Dexcool in it? (FWIW, the engine was rebuilt about 45K ago and has a stage 1C cam.) I'm hearing that the silicates in the green don't play nicely with the aluminum components, and it has me worried.