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Our 2011 Silverado DEF alerted us that our Exhaust Fluid is of poor quality and the engine light came on. We took it to our local Chev Dealer and they had to reprogram the computer thingy. the poor quality sign went away but yesterday when we were again towing the Monty the stupid lite came on again. Guess it will be another visit to the Dealer. No one else wants to mess with the DEF stuff.
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