So since I started the DPF removal thread for the LMM, and thanks to everyone's contributions and way more knowledgeable folks taking over it turned out to be a useful sticky, maybe we can discuss the urea exhaust fluid on the 2011+ here? I always figured it would become annoying especially going into limp mode and now that I've worked on plenty Audi Q7s with "Addblue" and back at the Chevy dealer seeing what a pain it is to install running boards due to the exhaust fluid tank (have to drop the urea reservoir to properly install regular running boards), let's start with a few questions I have. (please forgive if this has been discussed previously, I still would like to gather the Urea info in one place if possible).

1. Can we eliminate / bypass / turn-off the system and associated limp mode?

2. What harmful effects to the exhaust system can be caused by owners dumping liquids other than specified to satisfy the level sensor (corrosion, regen problems)?

Later I will post detailed description and operation of the system and any fresh updates coming out. Thanks!