Def fluid
Have a 2011 Duramax. Have had a sensor problem. Dealer says the def from Walmart is giving some problems. Any thoughts.
Forum Discussion
Have used Super Tech DEF from walmart for the last three years 38K miles with no problems. I fill it up when I'm going to pull the 5er more than 3000 miles. Other than that I add a gallon at a time when it gets low keeping it as fresh as I can.
