DEF is beginning to be a PITA for me at the moment. Not really the getting of it, more of the filling of it or should I say spilling of it.
I have 4700 miles on the loaner truck and I have had to fill the DEF twice now. The first time, the loaning dealer gave me 3 gallons of DEF for free.
which was VERY nice. However, no filler spout like people here are talking about.
Found a funnel at the house and proceeded to fill the tank up, it took 1.9 gallons to do so with the last .1 spilling out and on the driveway. It isn't overly caustic, but it does take the paint off the driveway and discolors your clothing... (This was at 1800 miles and right before my vacation drive)
Now, at 4700 miles need DEF again. Pilots, Loves, T/A's, and some Tpike service centers carry it (have to ask as it is always in the back and not on the shelf - ). Picked up a 2.5 Gal jug at a Pilot's for $13.99 + tax. Came with a filler tube - which I thought was nice as I am on the road... Attached the filler tube began to pour and it leaked DEF all over the truck, me, and driveway (argh!). DEF itches your skin, thankfully I was near a water hose when it happened. Also, DEF seems to splash out before it is "full". I thought I overfilled the DEF tank, however, it slowly seaped into the tank and allowed the remainder (about a quart) of the 2.5 gallon jug in, I bet I could pour a bunch more in again - going slow of course.
Fair warning, if you can't find a diesel station with DEF at the pump, wait till you get home, have your vehicle maintenance clothes on, and pour carefully.
Just my 2 cents - and I now know what to expect. Can't wait to find a spout that doesn't leak.