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I won't use any DEF except for the Blue DEF. Had problems with the system two years ago and they had to change out the complete exhaust system. I was told to use only the Blue DEF by the Regional Rep from GM. He said the other brands are watered down more than the Blue and the computer sensors can be messed up by using the other brands. We even traded trucks to avoid any other problems with the DEF. Been using the Blue and have had no problems since. Coinsidence? Who knows but I'm not taking any chances!
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