Leningrad

Hey everyone- I found my way here as I was trying to find information on the knock on my new Duramax. I just passed 1000 miles and it is still as present as ever and annoying! This is my second Duramax as I came from an 18 Chevy 2500 LTZ and never heard it on that engine? Hopefully we can get a absolute on what it is and if it should be there. I do feel better after coming here as it seems to be a pretty prevalent experience, I guess misery loves company haha!