Which brand of def fluid.
Was talking to the commercial truck guy at a ram dealer and he said they recommend using mopar brand def fluid in the cummins hd diesel.true or false.
Forum Discussion
I have went throgh countless containers of DEF since 2011 in a pickup, SUV and 2 motorhomes and have never had a DEF quality issue. I have used Terracair, Peak, Walmart brands, sometimes in gallon jugs but most in 2-1/2 gal jugs. In my opinion the dealers that are calling you out on poor quality DEF are incompetent, unscrupulous or both.
