I'll be the outlier here. Back in mid '90s when I did my 383 over I went with the cool new high tech long lasting Dexcool for my new engine. I really liked the 100k or 10 year life it was supposed to have. Flash forward to 2015 I was no where near the 100k but I was well past my due date so I changed it again. The fluid looked great. It never over heated on me and always ran cool. My second go around with it has been just as good so far. That car may be the exception to the rule, and like I say it was put in a fresh engine. On the flip side I've had more than one GM I've switched away from it because it crudded up and what not.