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.
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There is no way I would pay what they want for Mopar DEF. Its all the same. I have been using the brand that is sold at Tractor Supply called Terra Cair in my ram and haven't ever had an issue. It's 8 bucks for 2.5 gallons.
