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
Manual just calls for API certified, which it all is whether it's Peak, Super Tech or from the pump. I generally get it at the pump but have used the cheap Wally World stuff with no issues. Paying more for a name brand doesn't amount to a lot more money but it also isn't any better, imo - so why pay more? The nicest thing about getting it at the pump is you get to top it off accurately.
