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Come on guys. I like answering questions, but you're in front of a computer with access to the same internet as I. Search SCA (supplemental coolant additive). Use google, don't expect this forum to have all answers.
I looked up Nalcool. Yes it apears to be an SCA. It is not needed in the Cummins ISB. Plain green antifreeze has done me right for over 200k miles. Change it at the correct intervals and do something else with your spare time.
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