I used to drive a truck, a Mack CH with 500HP. We didn't use any additive. I currently have 180,000 miles on my '05 Duramax. The engine has never given any trouble and I've never used an additive. I used to own an '07 Duramax. I had no trouble in nearly 40,000 miles with no additive. I don't see the need to spend the extra money just to burn it out the tailpipe.
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