DEF issue at 6,000 miles

I always liked a used hammer it has proven itself, don't know so much about that shining new one. I use to have a 97 Fld120 ran into a guy in 2016 with a new Volvo. He use to have a 96 Fld120 said it always felt like it was going to leave him on the side of the road even though it didn't. He decided to get a new Volvo he said it left on the side of the road a few times & had to be towed in. I'm not hating on new technology but sometimes overkill is killing you. I still have a 99 KW. I don't want anything newer than a 2007. That's just me