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In my 05, I have been using ULSD since it came out without any problems or additives. Have over 66,000 miles on the TV without incident. Here in Clearwater. my GMC service advisor and their diesel mechanic say that while an additive won't hurt anything it is totally unnecessary and just one more expense we can all do without. I received pretty much the same advise from the GMC dealer in Dothan, Alabama last fall.
Like stiles said "You will have to determine whether it is necessary or not."
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