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We must not make the shortages worse, if there is a shortage. After my warranty runs out if I still have the Duramax, I will have the delete done. It is such a waste to be forced to use a product that is really not needed. I know several who have deleted the emissions, Trucks run much better fuel mileage. I do try to keep my DEF system full, but we are 875 miles from our home base. Good Luck.
I have not see a shortage of Rotella nor DEF fluid.
Happy trails.
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