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
The only thing I have seen about good v. bad kind to use is to use API certified DEF. Frankly, I haven't seen a brand that's not, but I imagine it's out there; I just haven't seen it. I haven't seen any that was expired either. Again, I'm sure it's out there. Things break and dealers always seem to want to blame someone else, even though they always get paid by someone to fix it.
