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Zerez G-05 is legit. "Old Green" works great in older motors, but has unwanted effects on corroding plastics and aluminum which are WAY to common on newer vehicles. My father decided to run green in my mom's 3800 after a flush, and not a few months later, blown manifold gasket led to engine hyrdolocking. If you have to change dex-cool every 3 years... and it costs $4 more a gallon... Come on people, it's not THAT much more.
One thing I didn't see mentioned is the use of Distilled water when filling the system. If you put in less minerals, there are less to build up in the system. I understand that when you flush it with a garden hose, you'll get tap water in there... But hey, I'm OCD.
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- Greg
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