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This has a been a long debate in many circles.
The one clear conclusion is that you can NOT mix them. If you are going to change the type of coolant, you must flush it first.
For what it is worth, my truck used green coolant since 95 (prior owner) and I have used it since. When my rad cracked (bottom weld) and it was replaced, I peeked inside and it was perfectly fine. If it was not for the fact I needed a rad then, I would have had mine repaired and went on.
NEVER use tap water. I buy premixed stuff now and it works fine in my opinion.
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"May you be in heaven a half an hour before the devil knows you're dead"
1992 4x4 PU
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