DexCool is probally the worst junk made.Ive flushed lots of GMs that were plugged by it.My 440 aluminum heads I run the Global type that mixes with anything.We pretty much used it at the shop on all the flushes we did.Just think how many people abuse their daily drivers.It works.The 50/50 mix is good if you dont want to buy distilled water.The green is slowly going out.Rocky