I agree with Ehrenberg, the Man knows his stuff.
I have the original antifreeze (21 years old) in a 360 Magnum, and well over 30 to 40 years old in 440's, 340's, 318's and a Slant 6. Rads are all original and only have replaced the odd water pump.
Sorry if anyone else has different experiences, but I have had zero issues.
I've had the same experience of it lasting forever but I was told this was caused by sitting and the aluminum. Antifreeze can become corrosive over the years. Shop calls it rot. Three things that helped cause it aluminum,cadmium plated steel T, and battery. You can see how clamp on tee by tank is rusted while the other clamp shows no damage.The red GM stuff will start taking out the water pump gasket after about 10 years. Won't hurt anything else. I've seem aluminum heads off diesel truck engines that had the yellow antifreeze in them and it looked like someone cut a groove in the head from water passage to cc. They said it's caused by the vibration of engine and causes it to separate and anyone whoever worked as a diesel mechanic knows better than to use it.
