SDMExplorerMar 23, 2018Def fluidHave a 2011 Duramax. Have had a sensor problem. Dealer says the def from Walmart is giving some problems. Any thoughts.
agesilausExplorer IIIMar 23, 2018Hogwash, DEF is 35% Urea solution. It's the same no matter where you get it.BK
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