Which Antifreeze for Cummins 12 Valve?

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Yea, sounds like the stuff you used was way stronger than the Prestone. Thanks for the info.
 
I have always used plain old cheap DAWN dish wash detergent for system cleaner. Works better than most and has no caustic junk. Just put in a cup or 2 and drive a few miles before draining and flushing.
 
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