Now 24k miles since CAT replacement with no issues on my 2014 Overland. I use Mopar DEF only. Lease ends in early 2017. Even though it is running well I'm not sure I'll keep it. I'm just too worried about having a huge expense after the warranty expires. Love the Overland Grand Cherokee in general. I might even get a gas one. Kind of sad, really. This is my 4th Jeep and the only one I've ever doubted the reliability of.