That's crazy. I think I probably paid $20 for DEF to cover the ~11,000 miles I drove in my truck last year (and I'd have to imagine it's thirstier than an econo

That's crazy. I think I probably paid $20 for DEF to cover the ~11,000 miles I drove in my truck last year (and I'd have to imagine it's thirstier than an economy car). You pop a blue cap under the hood, dump in the DEF, and you're done. RAM and Ford (starting this year I think?) make it even easier by putting the fill behind the fuel door right next to the fuel cap. 5 gallons seems to last me about ~5,000 miles. DEF only became required in US light-trucks ("1-ton" and below) for the 2015 Model-Year I think. Anyways, the fluid itself is about the same price as gasoline. A $300 service is just plain gouging.