Quote:
Originally Posted by G37sHKS
Hey, How did you know that your head gasket is toasted? Sorry if you mentioned my answer already I tried to look but didn't find answer.
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it was pretty obvious from the rough idle and white smoke, you can tell you have issues before full failure like this if you find you're pushing coolant out of the overflow/expansion under higher boost. also you may find carbon build up in the overflow tank. looks loke black residue