Otif

Hi everyone, I’m experiencing the same thing. Just took delivery of a 2021 Sierra with the Duramax on Friday, and noticed the smell last night when I parked at home. Naturallly, as this is my first diesel, I freaked out. The only difference with me is that I saw some smoke that looked like it was coming out around the passenger side headlight area. It went away after a few seconds, but freaked me out none the less. Is the smoke a part of the regen process as well? Thanks in advance