Worst coolant I've ever seen

Did it still have the orange Dexcool crap in it? My diesel looked like that when I got it. Talked to a friend that owned a radiator shop, Mike said that is often the result of someone mixing regular coolant in....

Yep. That's what was in it. I found it when I changed my heater core. Had to pull the dash, inner fender, and front passenger tire just to get the stupid heater core out, AND deal with the crap in the radiator. That was not a fun weekend at all. It was so gunked up that it didn't even want to drain and it was hard to get the radiator cap off. My Camaro has Dexcool in it too and it's supposed to be good for 100K (or 120k, I forget) miles but I'm only at 10k so far so I haven't checked it, I'm definitely NOT going to put regular coolant in it when the time comes. I wonder why it reacts with regular antifreeze, seems like it causes more problems than it's worth.